diff --git a/CHANGELOG.md b/CHANGELOG.md
index a729c1fa..f431d414 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 22/09/2020 - v0.8.2.4
+
+* (Add) Layer Importer: Option to merge images
+* (Improvement) Layer difference computation time, faster render
+
 ## 19/09/2020 - v0.8.2.3
 
 * (Add) Tooltip for next and previous layer buttons with associated shortcut (#61)
diff --git a/UVtools.Core/FileFormats/FileFormat.cs b/UVtools.Core/FileFormats/FileFormat.cs
index 7c72f152..3f245f25 100644
--- a/UVtools.Core/FileFormats/FileFormat.cs
+++ b/UVtools.Core/FileFormats/FileFormat.cs
@@ -354,7 +354,9 @@ public virtual uint LayerCount
 
 
         public abstract float PrintTime { get; }
-        
+
+        public float PrintTimeHours => (float) Math.Round(PrintTime / 3600, 2);
+
         public abstract float UsedMaterial { get; }
 
         public abstract float MaterialCost { get; }
diff --git a/UVtools.Core/FileFormats/IFileFormat.cs b/UVtools.Core/FileFormats/IFileFormat.cs
index e166b55c..3b778580 100644
--- a/UVtools.Core/FileFormats/IFileFormat.cs
+++ b/UVtools.Core/FileFormats/IFileFormat.cs
@@ -185,6 +185,11 @@ public interface IFileFormat
         /// </summary>
         float PrintTime { get; }
 
+        /// <summary>
+        /// Gets the estimate print time in hours
+        /// </summary>
+        float PrintTimeHours { get; }
+
         /// <summary>
         /// Gets the estimate used material in ml
         /// </summary>
diff --git a/UVtools.Core/Layer/LayerManager.cs b/UVtools.Core/Layer/LayerManager.cs
index ad3e1494..183a333c 100644
--- a/UVtools.Core/Layer/LayerManager.cs
+++ b/UVtools.Core/Layer/LayerManager.cs
@@ -1343,6 +1343,16 @@ public void Import(OperationLayerImport operation, OperationProgress progress =
             {
                 var mat = CvInvoke.Imread(operation.Files[i], ImreadModes.Grayscale);
                 uint layerIndex = (uint) (startIndex + i);
+                if (operation.MergeImages)
+                {
+                    if (!(this[layerIndex] is null))
+                    {
+                        using (var oldMat = this[layerIndex].LayerMat)
+                        {
+                            CvInvoke.Add(oldMat, mat, mat);
+                        }
+                    }
+                }
                 this[layerIndex] = new Layer(layerIndex, mat);
 
                 lock (progress.Mutex)
diff --git a/UVtools.Core/Operations/OperationLayerImport.cs b/UVtools.Core/Operations/OperationLayerImport.cs
index 89e31597..b7c8502f 100644
--- a/UVtools.Core/Operations/OperationLayerImport.cs
+++ b/UVtools.Core/Operations/OperationLayerImport.cs
@@ -80,6 +80,7 @@ public override StringTag Validate(params object[] parameters)
         public bool ReplaceStartLayer { get; set; }
         public bool ReplaceSubsequentLayers { get; set; }
         public bool DiscardRemainingLayers { get; set; }
+        public bool MergeImages { get; set; }
 
         public List<string> Files { get; } = new List<string>();
 
diff --git a/UVtools.Core/UVtools.Core.csproj b/UVtools.Core/UVtools.Core.csproj
index 9d1d0f17..df16c45c 100644
--- a/UVtools.Core/UVtools.Core.csproj
+++ b/UVtools.Core/UVtools.Core.csproj
@@ -10,12 +10,12 @@
     <RepositoryUrl>https://github.com/sn4k3/UVtools</RepositoryUrl>
     <PackageProjectUrl>https://github.com/sn4k3/UVtools</PackageProjectUrl>
     <Description>MSLA/DLP, file analysis, repair, conversion and manipulation</Description>
-    <Version>0.8.2.3</Version>
+    <Version>0.8.2.4</Version>
     <Copyright>Copyright © 2020 PTRTECH</Copyright>
     <PackageIcon>UVtools.png</PackageIcon>
     <Platforms>AnyCPU;x64</Platforms>
-    <AssemblyVersion>0.8.2.3</AssemblyVersion>
-    <FileVersion>0.8.2.3</FileVersion>
+    <AssemblyVersion>0.8.2.4</AssemblyVersion>
+    <FileVersion>0.8.2.4</FileVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
diff --git a/UVtools.GUI/Controls/Tools/CtrlToolLayerImport.Designer.cs b/UVtools.GUI/Controls/Tools/CtrlToolLayerImport.Designer.cs
index 66a17c1f..371dff4a 100644
--- a/UVtools.GUI/Controls/Tools/CtrlToolLayerImport.Designer.cs
+++ b/UVtools.GUI/Controls/Tools/CtrlToolLayerImport.Designer.cs
@@ -48,6 +48,7 @@ private void InitializeComponent()
             this.pbSelectedImage = new System.Windows.Forms.PictureBox();
             this.cbReplaceSubsequentLayers = new System.Windows.Forms.CheckBox();
             this.cbDiscardRemainingLayers = new System.Windows.Forms.CheckBox();
+            this.cbMergeImages = new System.Windows.Forms.CheckBox();
             ((System.ComponentModel.ISupportInitialize)(this.nmInsertAfterLayer)).BeginInit();
             this.tsBar.SuspendLayout();
             ((System.ComponentModel.ISupportInitialize)(this.splitContainer)).BeginInit();
@@ -276,11 +277,25 @@ private void InitializeComponent()
             this.cbDiscardRemainingLayers.UseVisualStyleBackColor = true;
             this.cbDiscardRemainingLayers.CheckedChanged += new System.EventHandler(this.EventClick);
             // 
+            // cbMergeImages
+            // 
+            this.cbMergeImages.AutoSize = true;
+            this.cbMergeImages.Enabled = false;
+            this.cbMergeImages.Location = new System.Drawing.Point(244, 83);
+            this.cbMergeImages.Margin = new System.Windows.Forms.Padding(4, 5, 4, 5);
+            this.cbMergeImages.Name = "cbMergeImages";
+            this.cbMergeImages.Size = new System.Drawing.Size(128, 24);
+            this.cbMergeImages.TabIndex = 41;
+            this.cbMergeImages.Text = "Merge images";
+            this.toolTip.SetToolTip(this.cbMergeImages, "Merge source layer with target layer\r\n(Require \"Replace subsequent layers\")");
+            this.cbMergeImages.UseVisualStyleBackColor = true;
+            this.cbMergeImages.CheckedChanged += new System.EventHandler(this.EventClick);
+            // 
             // CtrlToolLayerImport
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 20F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
-            this.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink;
+            this.Controls.Add(this.cbMergeImages);
             this.Controls.Add(this.cbDiscardRemainingLayers);
             this.Controls.Add(this.cbReplaceSubsequentLayers);
             this.Controls.Add(this.lbResult);
@@ -330,5 +345,6 @@ private void InitializeComponent()
         private System.Windows.Forms.PictureBox pbSelectedImage;
         private System.Windows.Forms.CheckBox cbReplaceSubsequentLayers;
         private System.Windows.Forms.CheckBox cbDiscardRemainingLayers;
+        private System.Windows.Forms.CheckBox cbMergeImages;
     }
 }
diff --git a/UVtools.GUI/Controls/Tools/CtrlToolLayerImport.cs b/UVtools.GUI/Controls/Tools/CtrlToolLayerImport.cs
index 41b591ab..53090af3 100644
--- a/UVtools.GUI/Controls/Tools/CtrlToolLayerImport.cs
+++ b/UVtools.GUI/Controls/Tools/CtrlToolLayerImport.cs
@@ -40,6 +40,7 @@ public override bool UpdateOperation()
             Operation.ReplaceStartLayer = cbReplaceStartLayer.Checked;
             Operation.ReplaceSubsequentLayers = cbReplaceSubsequentLayers.Checked;
             Operation.DiscardRemainingLayers = cbDiscardRemainingLayers.Checked;
+            Operation.MergeImages = cbMergeImages.Checked;
             return true;
         }
 
@@ -79,10 +80,12 @@ private void EventClick(object sender, EventArgs e)
             {
                 if (ReferenceEquals(sender, cbReplaceSubsequentLayers))
                 {
-                    cbDiscardRemainingLayers.Enabled = cbReplaceSubsequentLayers.Checked;
+                    cbDiscardRemainingLayers.Enabled = cbDiscardRemainingLayers.Enabled = cbReplaceSubsequentLayers.Checked;
+                    cbMergeImages.Enabled = cbReplaceSubsequentLayers.Checked;
                     if (!cbReplaceSubsequentLayers.Checked)
                     {
                         cbDiscardRemainingLayers.Checked = false;
+                        cbMergeImages.Checked = false;
                     }
                 }
 
diff --git a/UVtools.GUI/FrmMain.cs b/UVtools.GUI/FrmMain.cs
index 12867f67..ac3fe8c2 100644
--- a/UVtools.GUI/FrmMain.cs
+++ b/UVtools.GUI/FrmMain.cs
@@ -2275,7 +2275,7 @@ void ShowLayer(bool direction)
         /// Shows a layer number
         /// </summary>
         /// <param name="layerNum">Layer number</param>
-        void ShowLayer(uint layerNum)
+        unsafe void ShowLayer(uint layerNum)
         {
             if (SlicerFile is null) return;
 
@@ -2316,8 +2316,10 @@ void ShowLayer(uint layerNum)
 
                 CvInvoke.CvtColor(ActualLayerImage, ActualLayerImageBgr, ColorConversion.Gray2Bgr);
 
-                var imageSpan = ActualLayerImage.GetPixelSpan<byte>();
-                var imageBgrSpan = ActualLayerImageBgr.GetPixelSpan<byte>();
+                //var imageSpan = ActualLayerImage.GetPixelSpan<byte>();
+                //var imageBgrSpan = ActualLayerImageBgr.GetPixelSpan<byte>();
+                var imageSpan = ActualLayerImage.GetBytePointer();
+                var imageBgrSpan = ActualLayerImageBgr.GetBytePointer();
 
 
                 if (btnLayerImageLayerOutlineEdgeDetection.Checked)
@@ -2332,71 +2334,30 @@ void ShowLayer(uint layerNum)
                 {
                     if (layerNum > 0 && layerNum < SlicerFile.LayerCount - 1)
                     {
-                        using (var previousImage = SlicerFile[layerNum - 1].LayerMat)
-                        using (var nextImage = SlicerFile[layerNum + 1].LayerMat)
+                        Mat previousImage = null;
+                        Mat nextImage = null;
+
+                        // Can improve performance on >4K images?
+                        Parallel.Invoke(
+                () => { previousImage = SlicerFile[ActualLayer - 1].LayerMat; },
+                            () => { nextImage = SlicerFile[ActualLayer + 1].LayerMat; });
+
+                        /*using (var previousImage = SlicerFile[_actualLayer - 1].LayerMat)
+                        using (var nextImage = SlicerFile[_actualLayer + 1].LayerMat)
+                        {*/
+                        //var previousSpan = previousImage.GetPixelSpan<byte>();
+                        //var nextSpan = nextImage.GetPixelSpan<byte>();
+
+                        var previousSpan = previousImage.GetBytePointer();
+                        var nextSpan = nextImage.GetBytePointer();
+
+                        int width = ActualLayerImage.Width;
+                        int channels = ActualLayerImageBgr.NumberOfChannels;
+                        Parallel.For(0, ActualLayerImageBgr.Height, y =>
                         {
-                            var previousSpan = previousImage.GetPixelSpan<byte>();
-                            var nextSpan = nextImage.GetPixelSpan<byte>();
-
-                            /*Parallel.For(0, imageSpan.Length, i =>
-                            {
-                                var currentByte = ActualLayerImage.GetSinglePixelSpan<byte>(i);
-                                var previousByte = previousImage.GetSinglePixelSpan<byte>(i);
-                                var nextByte = nextImage.GetSinglePixelSpan<byte>(i);
-
-                                if (currentByte[0] != 0) return;
-                                Color color = Color.Empty;
-                                if (previousByte[0] > 0 && nextByte[0] > 0)
-                                {
-                                    color = Settings.Default.PreviousNextLayerColor;
-                                }
-                                else if (previousByte[0] > 0)
-                                {
-                                    color = Settings.Default.PreviousLayerColor;
-                                }
-                                else if (nextByte[0] > 0)
-                                {
-                                    color = Settings.Default.NextLayerColor;
-                                }
-
-                                if (color.IsEmpty) return;
-                                ActualLayerImageBgr.SetByte(i * 3, new[]{ color.B , color.G, color.R });
-                            });*/
-
-                            /*Parallel.For(0, ActualLayerImage.Height, y =>
-                            {
-                                var currentSpan = ActualLayerImage.GetPixelRowSpan<byte>(y);
-                                var currentRGBSpan = ActualLayerImageBgr.GetPixelRowSpan<byte>(y);
-                                var previousSpan = previousImage.GetPixelRowSpan<byte>(y);
-                                var nextSpan = nextImage.GetPixelRowSpan<byte>(y);
-
-                                for (int x = 0; x < currentSpan.Length; x++)
-                                {
-                                    if (currentSpan[x] != 0) continue;
-                                    Color color = Color.Empty;
-                                    if (previousSpan[x] > 0 && nextSpan[x] > 0)
-                                    {
-                                        color = Settings.Default.PreviousNextLayerColor;
-                                    }
-                                    else if (previousSpan[x] > 0)
-                                    {
-                                        color = Settings.Default.PreviousLayerColor;
-                                    }
-                                    else if (nextSpan[x] > 0)
-                                    {
-                                        color = Settings.Default.NextLayerColor;
-                                    }
-
-                                    if (color.IsEmpty) continue;
-                                    var bgrPixel = x * 3;
-                                    currentRGBSpan[bgrPixel] = color.B; // B
-                                    currentRGBSpan[++bgrPixel] = color.G; // G
-                                    currentRGBSpan[++bgrPixel] = color.R; // R
-                                }
-                            });*/
-
-                            for (int pixel = 0; pixel < imageSpan.Length; pixel++)
+                            for (int x = 0; x < width; x++)
                             {
+                                int pixel = y * width + x;
                                 if (imageSpan[pixel] != 0) continue;
                                 Color color = Color.Empty;
                                 if (previousSpan[pixel] > 0 && nextSpan[pixel] > 0)
@@ -2413,12 +2374,16 @@ void ShowLayer(uint layerNum)
                                 }
 
                                 if (color.IsEmpty) continue;
-                                var bgrPixel = pixel * 3;
+                                var bgrPixel = pixel * channels;
                                 imageBgrSpan[bgrPixel] = color.B; // B
                                 imageBgrSpan[++bgrPixel] = color.G; // G
                                 imageBgrSpan[++bgrPixel] = color.R; // R
+                                                                    //imageBgrSpan[++bgrPixel] = color.A; // A
                             }
-                        }
+                        });
+
+                        previousImage.Dispose();
+                        nextImage.Dispose();
                     }
                 }
 
diff --git a/UVtools.GUI/Properties/AssemblyInfo.cs b/UVtools.GUI/Properties/AssemblyInfo.cs
index e011fe66..dd226f76 100644
--- a/UVtools.GUI/Properties/AssemblyInfo.cs
+++ b/UVtools.GUI/Properties/AssemblyInfo.cs
@@ -35,5 +35,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("0.8.2.3")]
-[assembly: AssemblyFileVersion("0.8.2.3")]
+[assembly: AssemblyVersion("0.8.2.4")]
+[assembly: AssemblyFileVersion("0.8.2.4")]
diff --git a/UVtools.GUI/UVtools.GUI.csproj b/UVtools.GUI/UVtools.GUI.csproj
index b1269db5..4b2b1c56 100644
--- a/UVtools.GUI/UVtools.GUI.csproj
+++ b/UVtools.GUI/UVtools.GUI.csproj
@@ -41,6 +41,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <Prefer32Bit>false</Prefer32Bit>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>
@@ -51,6 +52,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <Prefer32Bit>false</Prefer32Bit>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
   <PropertyGroup>
     <ApplicationIcon>UVtools.ico</ApplicationIcon>
@@ -67,6 +69,7 @@
     <LangVersion>7.3</LangVersion>
     <ErrorReport>prompt</ErrorReport>
     <CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x64'">
     <OutputPath>bin\x64\Release\</OutputPath>
@@ -77,6 +80,7 @@
     <LangVersion>7.3</LangVersion>
     <ErrorReport>prompt</ErrorReport>
     <CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
   <PropertyGroup>
     <SignAssembly>false</SignAssembly>
diff --git a/UVtools.WPF/MainWindow.axaml b/UVtools.WPF/MainWindow.axaml
index 76f60c14..b18591d4 100644
--- a/UVtools.WPF/MainWindow.axaml
+++ b/UVtools.WPF/MainWindow.axaml
@@ -108,35 +108,135 @@
       </MenuItem>
     </Menu>
 
-    <Menu DockPanel.Dock="Bottom"
-          IsEnabled="{Binding IsFileLoaded}"
-          >
-      <MenuItem Header="_File">
-        <MenuItem Header="_Open..."/>
-        <Separator/>
-        <MenuItem Header="_Exit"/>
-      </MenuItem>
-      <MenuItem Header="_Edit">
-        <MenuItem Header="Copy"/>
-        <MenuItem Header="Paste"/>
-      </MenuItem>
-    </Menu>
+    <Border Padding="5" DockPanel.Dock="Bottom" Background="WhiteSmoke" IsVisible="{Binding IsFileLoaded}">
+      <StackPanel 
+        VerticalAlignment="Center" 
+        Orientation="Horizontal" 
+        Spacing="5"
+            >
+        <TextBlock Text="{Binding SlicerFile.LayerHeight, StringFormat=Layer height: \{0\}mm}"/>
+        <TextBlock Text="|"/>
+      
+        <TextBlock Text="{Binding SlicerFile.BottomLayerCount, StringFormat=Bottom layers: \{0\}}"/>
+        <TextBlock Text="|"/>
+      
+        <TextBlock Text="{Binding SlicerFile.BottomExposureTime, StringFormat=Bottom exposure: \{0\}s}"/>
+        <TextBlock Text="|"/>
+      
+        <TextBlock Text="{Binding SlicerFile.ExposureTime, StringFormat=Exposure: \{0\}s}"/>
+
+        <TextBlock IsVisible="{Binding SlicerFile.PrintTimeHours}"
+                   Text="|"/>
+        <TextBlock IsVisible="{Binding SlicerFile.PrintTimeHours}"
+          Text="{Binding SlicerFile.PrintTimeHours, StringFormat=Print time: \{0\}h}"/>
+
+
+        <TextBlock IsVisible="{Binding SlicerFile.UsedMaterial}"
+                   Text="|"/>
+        <TextBlock IsVisible="{Binding SlicerFile.UsedMaterial}"
+                    Text="{Binding SlicerFile.UsedMaterial, StringFormat=Used material: \{0\}ml}"/>
+
+
+        <TextBlock IsVisible="{Binding SlicerFile.MaterialCost}"
+                   Text="|"/>
+        <TextBlock IsVisible="{Binding SlicerFile.MaterialCost}"
+                   Text="{Binding SlicerFile.MaterialCost, StringFormat=Material cost: \{0\}ml}"/>
+
+
+        <TextBlock IsVisible="{Binding SlicerFile.MaterialName, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
+                   Text="|"/>
+        <TextBlock IsVisible="{Binding SlicerFile.MaterialName, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
+                   Text="{Binding SlicerFile.MaterialName, StringFormat=Material: \{0\}}"/>
+
+
+        <TextBlock IsVisible="{Binding SlicerFile.MachineName, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
+                   Text="|"/>
+        <TextBlock IsVisible="{Binding SlicerFile.MachineName, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
+                   Text="{Binding SlicerFile.MachineName, StringFormat=Machine: \{0\}}"/>
+      </StackPanel>
+    </Border>
 
     <TabControl 
-      IsEnabled="{Binding IsFileLoaded}" 
       DockPanel.Dock="Left" 
       Width="400"
-      SelectedIndex="3">
-      <TabItem>
+      SelectedIndex="{Binding TabSelectedIndex}">
+      <TabItem IsEnabled="{Binding IsFileLoaded}" >
         <TabItem.Header>
           <StackPanel VerticalAlignment="Center" Orientation="Horizontal">
             <Image Source="/Assets/Icons/button-info-16x16.png" Width="16"/>
             <TextBlock Margin="5,0,0,0">Information</TextBlock>
           </StackPanel>
         </TabItem.Header>
+
+        <Grid IsVisible="{Binding IsFileLoadeds}" RowDefinitions="Auto,Auto,Auto,*">
+          <StackPanel Background="WhiteSmoke"
+            Grid.Row="0" 
+            Orientation="Horizontal"
+            Spacing="5"
+            VerticalAlignment="Center">
+            <Button
+              IsEnabled="{Binding ThumbnailCanGoPrevious}"
+              Command="{Binding ThumbnailGoPrevious}"
+                    >
+              <Image Source="/Assets/Icons/back-16x16.png" Width="16"/>
+            </Button>
+
+            <TextBlock VerticalAlignment="Center">
+              <TextBlock.Text>
+                <MultiBinding StringFormat="\{0\}/\{1\}">
+                  <Binding Path="VisibleThumbnailIndex"/>
+                  <Binding Path="SlicerFile.CreatedThumbnailsCount"/>
+                </MultiBinding>
+              </TextBlock.Text>
+            </TextBlock>
+
+            <Button
+              IsEnabled="{Binding ThumbnailCanGoNext}"
+              Command="{Binding ThumbnailGoNext}"
+                    >
+              <Image Source="/Assets/Icons/next-16x16.png" Width="16"/>
+            </Button>
+
+          </StackPanel>
+
+          <StackPanel 
+            Grid.Row="0" 
+            Orientation="Horizontal" 
+            Spacing="5"
+            HorizontalAlignment="Right"
+            VerticalAlignment="Center">
+            <TextBlock VerticalAlignment="Center"
+                       Text="{Binding VisibleThumbnailResolution}"/>
+          </StackPanel>
+
+          <Image Grid.Row="1" Source="{Binding VisibleThumbnailImage}"/>
+
+          <DataGrid Grid.Row="3"
+                    CanUserReorderColumns="True"
+                    CanUserResizeColumns="True"
+                    CanUserSortColumns="True"
+                    GridLinesVisibility="All"
+                    IsReadOnly="True"
+                    ClipboardCopyMode="IncludeHeader"
+                    Items="{Binding SlicerProperties}">
+            <DataGrid.Columns>
+              <DataGridTextColumn  Header="Name"
+                                    Binding="{Binding Name}"
+                                    Width="Auto" />
+              <DataGridTextColumn Header="Value"
+                                  Binding="{Binding Value}"
+                                  Width="Auto" />
+              <DataGridTextColumn Header="Group"
+                                  Binding="{Binding Group}"
+                                  Width="Auto" />
+            </DataGrid.Columns>
+            
+          </DataGrid>
+        </Grid>
+        
       </TabItem>
 
-      <TabItem IsVisible="{Binding SlicerFile.HaveGCode}">
+      <TabItem IsVisible="{Binding HaveGCode}">
         <TabItem.Header>
           <StackPanel VerticalAlignment="Center" Orientation="Horizontal">
             <Image Source="/Assets/Icons/code-16x16.png" Width="16"/>
@@ -146,7 +246,7 @@
       </TabItem>
 
 
-      <TabItem>
+      <TabItem IsEnabled="{Binding IsFileLoaded}" >
         <TabItem.Header>
           <StackPanel VerticalAlignment="Center" Orientation="Horizontal">
             <Image Source="/Assets/Icons/warning-16x16.png" Width="16"/>
@@ -275,7 +375,6 @@
           Name="Layer.Navigation.Slider"
           Minimum="0"
           Maximum="{Binding SliderMaximumValue}"
-          Ticks="{Binding SliderMaximumValue}"
           Value="{Binding ActualLayer}"
           TickFrequency="1"
           TickPlacement="Outside"
@@ -357,7 +456,7 @@
       <StackPanel HorizontalAlignment="Left" Grid.Row="0" Orientation="Horizontal" Spacing="1">
         <ToggleButton
           IsChecked="{Binding ShowLayerImageRotated}"
-          HotKey="Ctrl + R"
+          HotKey="Ctrl+R"
           ToolTip.Tip="Auto rotate layer preview image at 90º (This can slow down the layer preview) [CTRL+R]"
           >
           <StackPanel Orientation="Horizontal">
@@ -397,10 +496,11 @@
         </ToggleButton>
 
         <Button 
-          ToolTip.Tip="Right click to access the various outlines."
+          ToolTip.Tip="Click to access the various outlines."
+          Command="{Binding #LayerPreviewOutlineContextMenu.Open}"
           >
           <Button.ContextMenu>
-            <ContextMenu PlacementMode="Bottom">
+            <ContextMenu Name="LayerPreviewOutlineContextMenu" PlacementMode="Bottom">
               <CheckBox 
                 IsChecked="{Binding ShowLayerOutlinePrintVolumeBoundary}"
                 Content="Print volume boundary"/>
diff --git a/UVtools.WPF/MainWindow.axaml.cs b/UVtools.WPF/MainWindow.axaml.cs
index 39c91014..88a0895b 100644
--- a/UVtools.WPF/MainWindow.axaml.cs
+++ b/UVtools.WPF/MainWindow.axaml.cs
@@ -19,6 +19,7 @@
 using Avalonia.Controls;
 using Avalonia.Input;
 using Avalonia.Markup.Xaml;
+using Avalonia.Media.Imaging;
 using Avalonia.Threading;
 using Emgu.CV;
 using Emgu.CV.CvEnum;
@@ -102,6 +103,7 @@ protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
         public Border LayerNavigationTooltipBorder;
 
         #region DataSets
+        public ObservableCollection<SlicerProperty> SlicerProperties { get; } = new ObservableCollection<SlicerProperty>();
         public ObservableCollection<LogItem> Logs { get; } = new ObservableCollection<LogItem>();
         public ObservableCollection<LayerIssue> Issues { get; } = new ObservableCollection<LayerIssue>();
         public ObservableCollection<PixelOperation> Drawings { get; } = new ObservableCollection<PixelOperation>();
@@ -113,6 +115,9 @@ protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
         private uint _actualLayer;
         private bool _isGUIEnabled = true;
         private bool _canSave;
+        private int _tabSelectedIndex;
+        private uint _visibleThumbnailIndex;
+        private Bitmap _visibleThumbnailImage;
         private bool _isVerbose;
         private bool _showLayerImageRotated;
         private bool _showLayerImageDifference;
@@ -135,7 +140,7 @@ public bool IsGUIEnabled
             {
                 if (!SetProperty(ref _isGUIEnabled, value)) return;
                 if (!_isGUIEnabled) return;
-                if (ProgressWindow.IsActive)
+                if (!(ProgressWindow is null))
                 {
                     Dispatcher.UIThread.InvokeAsync(() =>
                     {
@@ -151,16 +156,73 @@ public bool IsGUIEnabled
 
         public bool IsFileLoaded
         {
-            get => !ReferenceEquals(SlicerFile, null);
+            get => !(SlicerFile is null);
             set => OnPropertyChanged();
         }
 
+        public bool HaveGCode => IsFileLoaded && SlicerFile.HaveGCode;
+
         public bool CanSave
         {
             get => _canSave;
             set => SetProperty(ref _canSave, value);
         }
 
+        public int TabSelectedIndex
+        {
+            get => _tabSelectedIndex;
+            set => SetProperty(ref _tabSelectedIndex, value);
+        }
+
+        public uint VisibleThumbnailIndex
+        {
+            get => _visibleThumbnailIndex;
+            set
+            {
+                SetProperty(ref _visibleThumbnailIndex, value);
+                OnPropertyChanged(nameof(ThumbnailCanGoPrevious));
+                OnPropertyChanged(nameof(ThumbnailCanGoNext));
+                if (value == 0)
+                {
+                    VisibleThumbnailImage = null;
+                    return;
+                }
+
+                if (SlicerFile is null) return;
+                if (_visibleThumbnailIndex > SlicerFile.Thumbnails.Length) return;
+                VisibleThumbnailImage = SlicerFile.Thumbnails[_visibleThumbnailIndex-1].ToBitmap();
+            }
+        }
+
+        public bool ThumbnailCanGoPrevious => SlicerFile is { } && _visibleThumbnailIndex > 1;
+        public bool ThumbnailCanGoNext => SlicerFile is { } && _visibleThumbnailIndex < SlicerFile.Thumbnails.Length;
+
+        public void ThumbnailGoPrevious()
+        {
+            if (!ThumbnailCanGoPrevious) return;
+            VisibleThumbnailIndex--;
+        }
+
+        public void ThumbnailGoNext()
+        {
+            if (!ThumbnailCanGoNext) return;
+            VisibleThumbnailIndex++;
+        }
+
+        public Bitmap VisibleThumbnailImage
+        {
+            get => _visibleThumbnailImage;
+            set
+            {
+                SetProperty(ref _visibleThumbnailImage, value);
+                OnPropertyChanged(nameof(VisibleThumbnailResolution));
+            }
+        }
+
+        public string VisibleThumbnailResolution => _visibleThumbnailImage is null ? null : $"{{Width: {_visibleThumbnailImage.Size.Width}, Height: {_visibleThumbnailImage.Size.Height}}}";
+
+
+
         public bool IsVerbose
         {
             get => _isVerbose;
@@ -433,7 +495,9 @@ public void CloseFile()
             SlicerFile?.Dispose();
             App.SlicerFile = null;
             LayerCache.Clear();
+            VisibleThumbnailIndex = 0;
             LayerImageBox.Image = null;
+            SlicerProperties.Clear();
             ResetDataContext();
         }
 
@@ -512,6 +576,21 @@ async void ProcessFile(string fileName, uint actualLayer = 0)
             LayerImageBox.Image = bitmapRgb;*/
 
             _actualLayer = actualLayer;
+            if(SlicerFile.CreatedThumbnailsCount > 0) VisibleThumbnailIndex = 1;
+
+            if (!(SlicerFile.Configs is null))
+            {
+                foreach (var config in SlicerFile.Configs)
+                {
+                    var type = config.GetType();
+                    foreach (var property in type.GetProperties())
+                    {
+                        SlicerProperties.Add(new SlicerProperty(property.Name, property.GetValue(config, null)?.ToString(), type.Name));
+                    }
+                }
+            }
+
+
             ShowLayer();
             
             ResetDataContext();
diff --git a/UVtools.WPF/Structures/SlicerProperty.cs b/UVtools.WPF/Structures/SlicerProperty.cs
new file mode 100644
index 00000000..94cdc829
--- /dev/null
+++ b/UVtools.WPF/Structures/SlicerProperty.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Text;
+using Avalonia;
+using ReactiveUI;
+
+namespace UVtools.WPF.Structures
+{
+    public class SlicerProperty : ReactiveObject
+    {
+        private string _name;
+        private string _value;
+        private string _group;
+
+        public string Name
+        {
+            get => _name;
+            set => this.RaiseAndSetIfChanged(ref _name, value);
+        }
+
+        public string Value
+        {
+            get => _value;
+            set => this.RaiseAndSetIfChanged(ref _value, value);
+        }
+
+        public string Group
+        {
+            get => _group;
+            set => this.RaiseAndSetIfChanged(ref _group, value);
+        }
+
+        public SlicerProperty(string name, string value, string group = null)
+        {
+            _name = name;
+            _value = value;
+            _group = group;
+        }
+    }
+}