diff --git a/resources/etc/OpenBoard.config b/resources/etc/OpenBoard.config
index b0665b82..f6a0a3a9 100644
--- a/resources/etc/OpenBoard.config
+++ b/resources/etc/OpenBoard.config
@@ -124,6 +124,7 @@ Margin=20
 PageFormat=A4
 Resolution=300
 ZoomBehavior=4
+enableQualityLossToIncreaseZoomPerfs=true
 
 [Podcast]
 AudioRecordingDevice=Default
diff --git a/resources/forms/preferences.ui b/resources/forms/preferences.ui
index f9eef050..d570f56c 100644
--- a/resources/forms/preferences.ui
+++ b/resources/forms/preferences.ui
@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>825</width>
-    <height>810</height>
+    <height>830</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -82,86 +82,14 @@
    <item row="1" column="0">
     <widget class="QTabWidget" name="mainTabWidget">
      <property name="currentIndex">
-      <number>7</number>
+      <number>0</number>
      </property>
      <widget class="QWidget" name="displayTab">
       <attribute name="title">
        <string>Display</string>
       </attribute>
       <layout class="QGridLayout" name="gridLayout_3">
-       <item row="2" column="0">
-        <widget class="QGroupBox" name="multiDisplayGroupBox">
-         <property name="title">
-          <string>Multi display</string>
-         </property>
-         <layout class="QGridLayout" name="gridLayout_2">
-          <item row="1" column="3">
-           <spacer name="mirroringRSpacer">
-            <property name="orientation">
-             <enum>Qt::Horizontal</enum>
-            </property>
-            <property name="sizeHint" stdset="0">
-             <size>
-              <width>40</width>
-              <height>20</height>
-             </size>
-            </property>
-           </spacer>
-          </item>
-          <item row="1" column="0">
-           <spacer name="mirroringLSpacer">
-            <property name="orientation">
-             <enum>Qt::Horizontal</enum>
-            </property>
-            <property name="sizeType">
-             <enum>QSizePolicy::Preferred</enum>
-            </property>
-            <property name="sizeHint" stdset="0">
-             <size>
-              <width>40</width>
-              <height>20</height>
-             </size>
-            </property>
-           </spacer>
-          </item>
-          <item row="2" column="2">
-           <widget class="QCheckBox" name="swapControlAndDisplayScreensCheckBox">
-            <property name="text">
-             <string>Swap control display and view display</string>
-            </property>
-           </widget>
-          </item>
-          <item row="1" column="2">
-           <widget class="QCheckBox" name="displayBrowserPageCheckBox">
-            <property name="text">
-             <string>Show internal web page content on secondary screen or projector</string>
-            </property>
-           </widget>
-          </item>
-          <item row="2" column="3">
-           <widget class="QCheckBox" name="swapDisplayScreensCheckBox">
-            <property name="text">
-             <string>Swap first and second view displays</string>
-            </property>
-           </widget>
-          </item>
-         </layout>
-        </widget>
-       </item>
-       <item row="14" column="0">
-        <spacer name="modeSpacer">
-         <property name="orientation">
-          <enum>Qt::Vertical</enum>
-         </property>
-         <property name="sizeHint" stdset="0">
-          <size>
-           <width>20</width>
-           <height>40</height>
-          </size>
-         </property>
-        </spacer>
-       </item>
-       <item row="15" column="0">
+       <item row="16" column="0">
         <widget class="QGroupBox" name="modeGroupBox">
          <property name="sizePolicy">
           <sizepolicy hsizetype="MinimumExpanding" vsizetype="Expanding">
@@ -230,6 +158,204 @@
          </layout>
         </widget>
        </item>
+       <item row="7" column="0">
+        <spacer name="verticalSpacer_3">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item row="18" column="0">
+        <spacer name="verticalSpacer_7">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item row="9" column="0">
+        <spacer name="keyboardSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeType">
+          <enum>QSizePolicy::Expanding</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item row="15" column="0">
+        <spacer name="modeSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item row="14" column="0">
+        <widget class="QGroupBox" name="PDFGroupBox">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="MinimumExpanding" vsizetype="Expanding">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="title">
+          <string>PDF Rendering</string>
+         </property>
+         <layout class="QGridLayout" name="gridLayout_13">
+          <item row="0" column="1" colspan="2">
+           <layout class="QGridLayout" name="PDFZoomBehaviorGridLayout">
+            <item row="2" column="0">
+             <widget class="QCheckBox" name="enableQualityLossToIncreaseZoomPerfs">
+              <property name="text">
+               <string>Enable quality loss to increase zoom performances</string>
+              </property>
+              <property name="checked">
+               <bool>true</bool>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
+          <item row="0" column="0">
+           <spacer name="horizontalSpacer_11">
+            <property name="orientation">
+             <enum>Qt::Horizontal</enum>
+            </property>
+            <property name="sizeType">
+             <enum>QSizePolicy::Preferred</enum>
+            </property>
+            <property name="sizeHint" stdset="0">
+             <size>
+              <width>40</width>
+              <height>20</height>
+             </size>
+            </property>
+           </spacer>
+          </item>
+          <item row="0" column="3">
+           <spacer name="horizontalSpacer_12">
+            <property name="orientation">
+             <enum>Qt::Horizontal</enum>
+            </property>
+            <property name="sizeHint" stdset="0">
+             <size>
+              <width>40</width>
+              <height>20</height>
+             </size>
+            </property>
+           </spacer>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item row="8" column="0">
+        <widget class="QGroupBox" name="toolbarGroupBox">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="MinimumExpanding" vsizetype="Expanding">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="title">
+          <string>Toolbar</string>
+         </property>
+         <layout class="QGridLayout" name="gridLayout_9">
+          <item row="0" column="3">
+           <spacer name="toolbarRSpacer">
+            <property name="orientation">
+             <enum>Qt::Horizontal</enum>
+            </property>
+            <property name="sizeType">
+             <enum>QSizePolicy::Expanding</enum>
+            </property>
+            <property name="sizeHint" stdset="0">
+             <size>
+              <width>40</width>
+              <height>20</height>
+             </size>
+            </property>
+           </spacer>
+          </item>
+          <item row="0" column="2">
+           <widget class="QCheckBox" name="toolbarDisplayTextCheckBox">
+            <property name="text">
+             <string>Display Text Under Button</string>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="1">
+           <layout class="QGridLayout" name="gridLayout_10">
+            <item row="1" column="0">
+             <widget class="QRadioButton" name="toolbarAtBottomRadioButton">
+              <property name="text">
+               <string>Positioned at the Bottom (recommended for white boards)</string>
+              </property>
+             </widget>
+            </item>
+            <item row="0" column="0">
+             <widget class="QRadioButton" name="toolbarAtTopRadioButton">
+              <property name="text">
+               <string>Positioned at the Top (recommended for tablets)</string>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
+          <item row="0" column="0">
+           <spacer name="toolbarLSpacer">
+            <property name="orientation">
+             <enum>Qt::Horizontal</enum>
+            </property>
+            <property name="sizeType">
+             <enum>QSizePolicy::Preferred</enum>
+            </property>
+            <property name="sizeHint" stdset="0">
+             <size>
+              <width>40</width>
+              <height>20</height>
+             </size>
+            </property>
+           </spacer>
+          </item>
+         </layout>
+        </widget>
+       </item>
+       <item row="3" column="0">
+        <spacer name="toolbarSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
        <item row="4" column="0" rowspan="2">
         <widget class="QGroupBox" name="stylusPaletteGroupBox">
          <property name="minimumSize">
@@ -332,8 +458,8 @@
          </layout>
         </widget>
        </item>
-       <item row="13" column="0">
-        <widget class="QGroupBox" name="keyboardGroupBox">
+       <item row="17" column="0">
+        <widget class="QGroupBox" name="documentsGroupBox">
          <property name="sizePolicy">
           <sizepolicy hsizetype="MinimumExpanding" vsizetype="Expanding">
            <horstretch>0</horstretch>
@@ -341,37 +467,50 @@
           </sizepolicy>
          </property>
          <property name="title">
-          <string>Virtual Keyboard</string>
+          <string>Documents Mode</string>
          </property>
-         <layout class="QGridLayout" name="gridLayout_13">
-          <item row="0" column="1" colspan="2">
-           <layout class="QGridLayout" name="oskGridLayout">
-            <item row="3" column="1">
-             <widget class="QComboBox" name="keyboardPaletteKeyButtonSize"/>
+         <layout class="QGridLayout" name="gridLayout_19">
+          <item row="0" column="1">
+           <layout class="QGridLayout" name="gridLayout_18">
+            <item row="0" column="1">
+             <widget class="QCheckBox" name="showDateColumnOnAlphabeticalSort">
+              <property name="sizePolicy">
+               <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
+                <horstretch>0</horstretch>
+                <verstretch>0</verstretch>
+               </sizepolicy>
+              </property>
+              <property name="text">
+               <string>Display date column on alphabetical sort</string>
+              </property>
+             </widget>
             </item>
-            <item row="3" column="0">
-             <widget class="QLabel" name="keyboardPaletteKeyButtonSize_Label">
+            <item row="3" column="1">
+             <widget class="QCheckBox" name="emptyTrashForOlderDocuments">
               <property name="text">
-               <string>Built-in virtual keyboard button size:</string>
+               <string>Empty trash for documents older than</string>
               </property>
              </widget>
             </item>
-            <item row="2" column="0">
-             <widget class="QCheckBox" name="useSystemOSKCheckBox">
+            <item row="3" column="2">
+             <widget class="QSpinBox" name="emptyTrashDaysValue"/>
+            </item>
+            <item row="3" column="3">
+             <widget class="QLabel" name="emptyTrashDaysLabel">
               <property name="text">
-               <string>Use system keyboard (recommended)</string>
+               <string>days</string>
               </property>
              </widget>
             </item>
            </layout>
           </item>
-          <item row="0" column="0">
-           <spacer name="horizontalSpacer">
+          <item row="0" column="0" rowspan="2">
+           <spacer name="horizontalSpacer_9">
             <property name="orientation">
              <enum>Qt::Horizontal</enum>
             </property>
             <property name="sizeType">
-             <enum>QSizePolicy::Preferred</enum>
+             <enum>QSizePolicy::Fixed</enum>
             </property>
             <property name="sizeHint" stdset="0">
              <size>
@@ -381,8 +520,8 @@
             </property>
            </spacer>
           </item>
-          <item row="0" column="3">
-           <spacer name="horizontalSpacer_2">
+          <item row="0" column="2">
+           <spacer name="horizontalSpacer_10">
             <property name="orientation">
              <enum>Qt::Horizontal</enum>
             </property>
@@ -397,73 +536,17 @@
          </layout>
         </widget>
        </item>
-       <item row="7" column="0">
-        <spacer name="verticalSpacer_3">
-         <property name="orientation">
-          <enum>Qt::Vertical</enum>
-         </property>
-         <property name="sizeHint" stdset="0">
-          <size>
-           <width>20</width>
-           <height>40</height>
-          </size>
-         </property>
-        </spacer>
-       </item>
-       <item row="8" column="0">
-        <widget class="QGroupBox" name="toolbarGroupBox">
-         <property name="sizePolicy">
-          <sizepolicy hsizetype="MinimumExpanding" vsizetype="Expanding">
-           <horstretch>0</horstretch>
-           <verstretch>0</verstretch>
-          </sizepolicy>
-         </property>
+       <item row="2" column="0">
+        <widget class="QGroupBox" name="multiDisplayGroupBox">
          <property name="title">
-          <string>Toolbar</string>
+          <string>Multi display</string>
          </property>
-         <layout class="QGridLayout" name="gridLayout_9">
-          <item row="0" column="1">
-           <layout class="QGridLayout" name="gridLayout_10">
-            <item row="0" column="0">
-             <widget class="QRadioButton" name="toolbarAtTopRadioButton">
-              <property name="text">
-               <string>Positioned at the Top (recommended for tablets)</string>
-              </property>
-             </widget>
-            </item>
-            <item row="1" column="0">
-             <widget class="QRadioButton" name="toolbarAtBottomRadioButton">
-              <property name="text">
-               <string>Positioned at the Bottom (recommended for white boards)</string>
-              </property>
-             </widget>
-            </item>
-            <item row="2" column="0">
-             <spacer name="verticalSpacer">
-              <property name="orientation">
-               <enum>Qt::Vertical</enum>
-              </property>
-              <property name="sizeType">
-               <enum>QSizePolicy::Fixed</enum>
-              </property>
-              <property name="sizeHint" stdset="0">
-               <size>
-                <width>20</width>
-                <height>20</height>
-               </size>
-              </property>
-             </spacer>
-            </item>
-           </layout>
-          </item>
-          <item row="0" column="0">
-           <spacer name="toolbarLSpacer">
+         <layout class="QGridLayout" name="gridLayout_2">
+          <item row="1" column="3">
+           <spacer name="mirroringRSpacer">
             <property name="orientation">
              <enum>Qt::Horizontal</enum>
             </property>
-            <property name="sizeType">
-             <enum>QSizePolicy::Preferred</enum>
-            </property>
             <property name="sizeHint" stdset="0">
              <size>
               <width>40</width>
@@ -472,13 +555,13 @@
             </property>
            </spacer>
           </item>
-          <item row="0" column="2">
-           <spacer name="toolbarRSpacer">
+          <item row="1" column="0">
+           <spacer name="mirroringLSpacer">
             <property name="orientation">
              <enum>Qt::Horizontal</enum>
             </property>
             <property name="sizeType">
-             <enum>QSizePolicy::Expanding</enum>
+             <enum>QSizePolicy::Preferred</enum>
             </property>
             <property name="sizeHint" stdset="0">
              <size>
@@ -488,60 +571,32 @@
             </property>
            </spacer>
           </item>
-          <item row="1" column="1">
-           <widget class="QCheckBox" name="toolbarDisplayTextCheckBox">
+          <item row="2" column="2">
+           <widget class="QCheckBox" name="swapControlAndDisplayScreensCheckBox">
             <property name="text">
-             <string>Display Text Under Button</string>
+             <string>Swap control display and view display</string>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="2">
+           <widget class="QCheckBox" name="displayBrowserPageCheckBox">
+            <property name="text">
+             <string>Show internal web page content on secondary screen or projector</string>
+            </property>
+           </widget>
+          </item>
+          <item row="2" column="3">
+           <widget class="QCheckBox" name="swapDisplayScreensCheckBox">
+            <property name="text">
+             <string>Swap first and second view displays</string>
             </property>
            </widget>
           </item>
          </layout>
         </widget>
        </item>
-       <item row="17" column="0">
-        <spacer name="verticalSpacer_7">
-         <property name="orientation">
-          <enum>Qt::Vertical</enum>
-         </property>
-         <property name="sizeHint" stdset="0">
-          <size>
-           <width>20</width>
-           <height>40</height>
-          </size>
-         </property>
-        </spacer>
-       </item>
-       <item row="9" column="0">
-        <spacer name="keyboardSpacer">
-         <property name="orientation">
-          <enum>Qt::Vertical</enum>
-         </property>
-         <property name="sizeType">
-          <enum>QSizePolicy::Expanding</enum>
-         </property>
-         <property name="sizeHint" stdset="0">
-          <size>
-           <width>20</width>
-           <height>40</height>
-          </size>
-         </property>
-        </spacer>
-       </item>
-       <item row="3" column="0">
-        <spacer name="toolbarSpacer">
-         <property name="orientation">
-          <enum>Qt::Vertical</enum>
-         </property>
-         <property name="sizeHint" stdset="0">
-          <size>
-           <width>20</width>
-           <height>40</height>
-          </size>
-         </property>
-        </spacer>
-       </item>
-       <item row="16" column="0">
-        <widget class="QGroupBox" name="documentsGroupBox">
+       <item row="13" column="0">
+        <widget class="QGroupBox" name="keyboardGroupBox">
          <property name="sizePolicy">
           <sizepolicy hsizetype="MinimumExpanding" vsizetype="Expanding">
            <horstretch>0</horstretch>
@@ -549,50 +604,37 @@
           </sizepolicy>
          </property>
          <property name="title">
-          <string>Documents Mode</string>
+          <string>Virtual Keyboard</string>
          </property>
-         <layout class="QGridLayout" name="gridLayout_19">
+         <layout class="QGridLayout" name="gridLayout_21">
           <item row="0" column="1">
-           <layout class="QGridLayout" name="gridLayout_18">
-            <item row="0" column="1">
-             <widget class="QCheckBox" name="showDateColumnOnAlphabeticalSort">
-              <property name="sizePolicy">
-               <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
-                <horstretch>0</horstretch>
-                <verstretch>0</verstretch>
-               </sizepolicy>
-              </property>
-              <property name="text">
-               <string>Display date column on alphabetical sort</string>
-              </property>
-             </widget>
-            </item>
+           <layout class="QGridLayout" name="oskGridLayout">
             <item row="3" column="1">
-             <widget class="QCheckBox" name="emptyTrashForOlderDocuments">
+             <widget class="QComboBox" name="keyboardPaletteKeyButtonSize"/>
+            </item>
+            <item row="3" column="0">
+             <widget class="QLabel" name="keyboardPaletteKeyButtonSize_Label">
               <property name="text">
-               <string>Empty trash for documents older than</string>
+               <string>Built-in virtual keyboard button size:</string>
               </property>
              </widget>
             </item>
-            <item row="3" column="2">
-             <widget class="QSpinBox" name="emptyTrashDaysValue"/>
-            </item>
-            <item row="3" column="3">
-             <widget class="QLabel" name="emptyTrashDaysLabel">
+            <item row="2" column="0">
+             <widget class="QCheckBox" name="useSystemOSKCheckBox">
               <property name="text">
-               <string>days</string>
+               <string>Use system keyboard (recommended)</string>
               </property>
              </widget>
             </item>
            </layout>
           </item>
-          <item row="0" column="0" rowspan="2">
-           <spacer name="horizontalSpacer_9">
+          <item row="0" column="0">
+           <spacer name="horizontalSpacer">
             <property name="orientation">
              <enum>Qt::Horizontal</enum>
             </property>
             <property name="sizeType">
-             <enum>QSizePolicy::Fixed</enum>
+             <enum>QSizePolicy::Preferred</enum>
             </property>
             <property name="sizeHint" stdset="0">
              <size>
@@ -603,7 +645,7 @@
            </spacer>
           </item>
           <item row="0" column="2">
-           <spacer name="horizontalSpacer_10">
+           <spacer name="horizontalSpacer_2">
             <property name="orientation">
              <enum>Qt::Horizontal</enum>
             </property>
@@ -1064,7 +1106,7 @@
           </sizepolicy>
          </property>
          <property name="currentIndex">
-          <number>1</number>
+          <number>4</number>
          </property>
          <widget class="QWidget" name="OpenSSLTab">
           <attribute name="title">
@@ -3065,7 +3107,7 @@ Public License instead of this License.  But first, please read
           <string notr="true">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 p, li { white-space: pre-wrap; }
-&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Ubuntu'; font-size:11pt; font-weight:400; font-style:normal;&quot;&gt;
+&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Sans Serif'; font-size:9pt; font-weight:400; font-style:normal;&quot;&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:12pt; font-weight:600;&quot;&gt;Translations&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;&lt;br /&gt;&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;A special thanks to:&lt;/span&gt;&lt;/p&gt;
@@ -3093,7 +3135,7 @@ p, li { white-space: pre-wrap; }
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;&lt;br /&gt;&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;&lt;br /&gt;&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:12pt; font-weight:600;&quot;&gt;Resources added in OpenBoard&lt;/span&gt;&lt;/p&gt;
-&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Ubuntu';&quot;&gt;&lt;br /&gt;&lt;/p&gt;
+&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Ubuntu'; font-size:11pt;&quot;&gt;&lt;br /&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;AndBasR.ttf &lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;Sil Open Font License&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;a href=&quot;http://scripts.sil.org/OFL&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt; text-decoration: underline; color:#0000ff;&quot;&gt;http://scripts.sil.org/OFL&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;
@@ -3122,10 +3164,10 @@ p, li { white-space: pre-wrap; }
 &lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;a href=&quot;http://www.ge.ch/sem/cc/by-nc-nd/&quot;&gt;&lt;span style=&quot; font-family:'Lucida Grande'; font-size:10pt; text-decoration: underline; color:#0000ff;&quot;&gt;http://www.ge.ch/sem/cc/by-nc-nd/&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;© 2005-2015, Vista Multimedia SA, Droit de diffusion Etat de Genève - DIP&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;a href=&quot;http://edu.ge.ch/sem/node/1294&quot;&gt;&lt;span style=&quot; font-family:'Lucida Grande'; font-size:10pt; text-decoration: underline; color:#0000ff;&quot;&gt;http://edu.ge.ch/sem/node/1294&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;
-&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Ubuntu';&quot;&gt;&lt;br /&gt;&lt;/p&gt;
+&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Ubuntu'; font-size:11pt;&quot;&gt;&lt;br /&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Ubuntu'; font-size:10pt;&quot;&gt;GraphMe Widget 2.1&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Ubuntu'; font-size:10pt;&quot;&gt;Yannick Vessaz&lt;/span&gt;&lt;/p&gt;
-&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Ubuntu';&quot;&gt;&lt;br /&gt;&lt;/p&gt;
+&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Ubuntu'; font-size:11pt;&quot;&gt;&lt;br /&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Ubuntu'; font-size:10pt;&quot;&gt;QR-Code Widget&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Ubuntu'; font-size:10pt;&quot;&gt;Basilstotz&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Ubuntu'; font-size:10pt;&quot;&gt;Licence: CCO&lt;/span&gt;&lt;/p&gt;
@@ -3148,7 +3190,7 @@ p, li { white-space: pre-wrap; }
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;David Eccles (gringer)&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;a href=&quot;http://creativecommons.org/licenses/by-sa/3.0/deed.en&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt; text-decoration: underline; color:#0000ff;&quot;&gt;Creative Commons Attribution-Share Alike 3.0 Unported&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;a href=&quot;http://commons.wikimedia.org/wiki/File:Worldmap_wdb_combined.svg&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt; text-decoration: underline; color:#0000ff;&quot;&gt;http://commons.wikimedia.org/wiki/File:Worldmap_wdb_combined.svg&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;
-&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Ubuntu';&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Ubuntu'; font-size:11pt;&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
          </property>
          <property name="openExternalLinks">
           <bool>true</bool>
@@ -3171,7 +3213,7 @@ p, li { white-space: pre-wrap; }
           <string notr="true">&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 p, li { white-space: pre-wrap; }
-&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Ubuntu'; font-size:11pt; font-weight:400; font-style:normal;&quot;&gt;
+&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Sans Serif'; font-size:9pt; font-weight:400; font-style:normal;&quot;&gt;
 &lt;table border=&quot;0&quot; style=&quot;-qt-table-type: root; margin-top:4px; margin-bottom:4px; margin-left:4px; margin-right:4px;&quot;&gt;
 &lt;tr&gt;
 &lt;td style=&quot;border: none;&quot;&gt;
@@ -3190,9 +3232,9 @@ p, li { white-space: pre-wrap; }
 &lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;Case Postale 241&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;1211 Genève 8&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;Switzerland&lt;/span&gt;&lt;/p&gt;
-&lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;a href=&quot;http://www.openboard.ch&quot;&gt;&lt;span style=&quot; font-family:'.Helvetica Neue DeskInterface'; text-decoration: underline; color:#0000ff;&quot;&gt;openboard.ch&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;
-&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'.Helvetica Neue DeskInterface'; text-decoration: underline; color:#0000ff;&quot;&gt;&lt;br /&gt;&lt;/p&gt;
-&lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;emails: &lt;/span&gt;&lt;a href=&quot;mailto:sem.logistique@edu.ge.ch&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt; text-decoration: underline; color:#0000ff;&quot;&gt;sem.logistique@edu.ge.ch&lt;/span&gt;&lt;/a&gt;&lt;span style=&quot; font-family:'Ubuntu';&quot;&gt;, &lt;/span&gt;&lt;a href=&quot;mailto:sem.logistique@edu.ge.ch&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt; text-decoration: underline; color:#0000ff;&quot;&gt;support@openboard.ch&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/body&gt;&lt;/html&gt;</string>
+&lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;a href=&quot;http://www.openboard.ch&quot;&gt;&lt;span style=&quot; font-family:'.Helvetica Neue DeskInterface'; font-size:11pt; text-decoration: underline; color:#0000ff;&quot;&gt;openboard.ch&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;
+&lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'.Helvetica Neue DeskInterface'; font-size:11pt; text-decoration: underline; color:#0000ff;&quot;&gt;&lt;br /&gt;&lt;/p&gt;
+&lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;emails: &lt;/span&gt;&lt;a href=&quot;mailto:sem.logistique@edu.ge.ch&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt; text-decoration: underline; color:#0000ff;&quot;&gt;sem.logistique@edu.ge.ch&lt;/span&gt;&lt;/a&gt;&lt;span style=&quot; font-family:'Ubuntu'; font-size:11pt;&quot;&gt;, &lt;/span&gt;&lt;a href=&quot;mailto:sem.logistique@edu.ge.ch&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt; text-decoration: underline; color:#0000ff;&quot;&gt;support@openboard.ch&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;/body&gt;&lt;/html&gt;</string>
          </property>
          <property name="openExternalLinks">
           <bool>true</bool>
diff --git a/src/core/UBPreferencesController.cpp b/src/core/UBPreferencesController.cpp
index 9ecceeec..2cbe8e06 100644
--- a/src/core/UBPreferencesController.cpp
+++ b/src/core/UBPreferencesController.cpp
@@ -138,6 +138,10 @@ void UBPreferencesController::wire()
     connect(mPreferencesUI->useSystemOSKCheckBox, SIGNAL(clicked(bool)), settings->useSystemOnScreenKeyboard, SLOT(setBool(bool)));
     connect(mPreferencesUI->useSystemOSKCheckBox, SIGNAL(clicked(bool)), this, SLOT(systemOSKCheckBoxToggled(bool)));
 
+    //Zoom Behavior preferences
+    connect(mPreferencesUI->enableQualityLossToIncreaseZoomPerfs, SIGNAL(clicked(bool)), settings->enableQualityLossToIncreaseZoomPerfs, SLOT(setBool(bool)));
+    connect(mPreferencesUI->enableQualityLossToIncreaseZoomPerfs, SIGNAL(clicked(bool)), this, SLOT(setPdfZoomBehavior(bool)));
+
     // Documents Mode preferences
     connect(mPreferencesUI->showDateColumnOnAlphabeticalSort, SIGNAL(clicked(bool)), settings->showDateColumnOnAlphabeticalSort, SLOT(setBool(bool)));
     connect(mPreferencesUI->showDateColumnOnAlphabeticalSort, SIGNAL(clicked(bool)), UBApplication::documentController, SLOT(refreshDateColumns()));
@@ -282,6 +286,8 @@ void UBPreferencesController::init()
     mPreferencesUI->useSystemOSKCheckBox->setChecked(settings->useSystemOnScreenKeyboard->get().toBool());
     this->systemOSKCheckBoxToggled(mPreferencesUI->useSystemOSKCheckBox->isChecked());
 
+    mPreferencesUI->enableQualityLossToIncreaseZoomPerfs->setChecked(settings->enableQualityLossToIncreaseZoomPerfs->get().toBool());
+
     mPreferencesUI->showDateColumnOnAlphabeticalSort->setChecked(settings->showDateColumnOnAlphabeticalSort->get().toBool());
     mPreferencesUI->emptyTrashForOlderDocuments->setChecked(settings->emptyTrashForOlderDocuments->get().toBool());
     mPreferencesUI->emptyTrashDaysValue->setValue(settings->emptyTrashDaysValue->get().toInt());
@@ -354,6 +360,8 @@ void UBPreferencesController::defaultSettings()
         mPreferencesUI->showDateColumnOnAlphabeticalSort->setChecked(settings->showDateColumnOnAlphabeticalSort->reset().toBool());
         UBApplication::documentController->refreshDateColumns();
 
+        mPreferencesUI->enableQualityLossToIncreaseZoomPerfs->setChecked(settings->enableQualityLossToIncreaseZoomPerfs->reset().toBool());
+
         mPreferencesUI->emptyTrashForOlderDocuments->setChecked(settings->emptyTrashForOlderDocuments->reset().toBool());
         mPreferencesUI->emptyTrashDaysValue->setValue(settings->emptyTrashDaysValue->reset().toInt());
 
@@ -655,6 +663,18 @@ void UBPreferencesController::systemOSKCheckBoxToggled(bool checked)
     mPreferencesUI->keyboardPaletteKeyButtonSize_Label->setVisible(!checked);
 }
 
+void UBPreferencesController::setPdfZoomBehavior(bool checked)
+{
+    if (checked)
+    {
+        UBSettings::settings()->pdfZoomBehavior->setInt(4);// Multithreaded, several steps, downsampled.
+    }
+    else
+    {
+        UBSettings::settings()->pdfZoomBehavior->setInt(0);//Old behavior. To remove if no issues found with the other mode
+    }
+}
+
 UBBrushPropertiesFrame::UBBrushPropertiesFrame(QFrame* owner, const QList<QColor>& lightBackgroundColors,
                                                const QList<QColor>& darkBackgroundColors, const QList<QColor>& lightBackgroundSelectedColors,
                                                const QList<QColor>& darkBackgroundSelectedColors, UBPreferencesController* controller)
diff --git a/src/core/UBPreferencesController.h b/src/core/UBPreferencesController.h
index d94f4403..2a6b21b3 100644
--- a/src/core/UBPreferencesController.h
+++ b/src/core/UBPreferencesController.h
@@ -102,6 +102,7 @@ class UBPreferencesController : public QObject
         void toolbarOrientationVertical(bool checked);
         void toolbarOrientationHorizontal(bool checked);
         void systemOSKCheckBoxToggled(bool checked);
+        void setPdfZoomBehavior(bool checked);
 
     private slots:
         void adjustScreens(int screen);
diff --git a/src/core/UBSettings.cpp b/src/core/UBSettings.cpp
index 78be3c15..1920d90b 100644
--- a/src/core/UBSettings.cpp
+++ b/src/core/UBSettings.cpp
@@ -408,7 +408,9 @@ void UBSettings::init()
     pdfMargin = new UBSetting(this, "PDF", "Margin", "20");
     pdfPageFormat = new UBSetting(this, "PDF", "PageFormat", "A4");
     pdfResolution = new UBSetting(this, "PDF", "Resolution", "300");
+
     pdfZoomBehavior = new UBSetting(this, "PDF", "ZoomBehavior", "4");
+    enableQualityLossToIncreaseZoomPerfs = new UBSetting(this, "PDF", "enableQualityLossToIncreaseZoomPerfs", true);
 
     podcastFramesPerSecond = new UBSetting(this, "Podcast", "FramesPerSecond", 10);
     podcastVideoSize = new UBSetting(this, "Podcast", "VideoSize", "Medium");
diff --git a/src/core/UBSettings.h b/src/core/UBSettings.h
index 5b287354..a7353108 100644
--- a/src/core/UBSettings.h
+++ b/src/core/UBSettings.h
@@ -359,7 +359,9 @@ class UBSettings : public QObject
         UBSetting* pdfMargin;
         UBSetting* pdfPageFormat;
         UBSetting* pdfResolution;
+
         UBSetting* pdfZoomBehavior;
+        UBSetting* enableQualityLossToIncreaseZoomPerfs;
 
         UBSetting* podcastFramesPerSecond;
         UBSetting* podcastVideoSize;
diff --git a/src/pdf/XPDFRenderer.cpp b/src/pdf/XPDFRenderer.cpp
index 045156e8..a81616b8 100644
--- a/src/pdf/XPDFRenderer.cpp
+++ b/src/pdf/XPDFRenderer.cpp
@@ -54,9 +54,9 @@ XPDFRenderer::XPDFRenderer(const QString &filename, bool importingFile)
 {
     switch (m_pdfZoomMode) {
         case 0: // Render each time (historical initial implementation).
+        default:
         break;
         case 1: // Render a single image, degradated quality when zoomed big.
-        default:
             m_pdfZoomCache.push_back(XPDFRendererZoomFactor::mode1_zoomFactor);
         break;
         case 2: // Render three images, use downsampling, optimal quality all the time, slower.