diff --git a/Gallery.Share/App.cs b/Gallery.Share/App.cs
index 8a30d38..4eada77 100644
--- a/Gallery.Share/App.cs
+++ b/Gallery.Share/App.cs
@@ -16,12 +16,7 @@ namespace Gallery
         public static PlatformCulture CurrentCulture { get; private set; }
 
         public static Dictionary<string, System.DateTime> RefreshTimes { get; } = new();
-        public static List<IGallerySource> GallerySources { get; } = new()
-        {
-            new Sources.Yandere.GallerySource(),    // https://yande.re
-            new Sources.Danbooru.GallerySource(),   // https://danbooru.donmai.us
-            new Sources.Gelbooru.GallerySource()    // https://gelbooru.com
-        };
+        public static List<IGallerySource> GallerySources { get; private set; }
 
         public App()
         {
@@ -42,7 +37,7 @@ namespace Gallery
         private void InitPreference()
         {
             Config.Proxy = null;
-            Config.DownloadThreads = Preferences.Get(Config.DownloadThreadsKey, 1);
+            Config.DownloadThreads = Preferences.Get(Config.DownloadThreadsKey, 4);
 
             var isProxied = Preferences.Get(Config.IsProxiedKey, false);
             if (isProxied)
@@ -109,6 +104,14 @@ namespace Gallery
         protected override void OnStart()
         {
             InitLanguage();
+
+            GallerySources = new List<IGallerySource>()
+            {
+                new Sources.Yandere.GallerySource(),    // https://yande.re
+                new Sources.Danbooru.GallerySource(),   // https://danbooru.donmai.us
+                new Sources.Gelbooru.GallerySource()    // https://gelbooru.com
+            };
+
             MainPage = new AppShell();
 
             InitResource();
@@ -117,6 +120,7 @@ namespace Gallery
 
         protected override void OnSleep()
         {
+            base.OnSleep();
         }
 
         protected override void OnResume()
diff --git a/Gallery.Share/AppShell.xaml b/Gallery.Share/AppShell.xaml
index eba9390..61f7234 100644
--- a/Gallery.Share/AppShell.xaml
+++ b/Gallery.Share/AppShell.xaml
@@ -57,7 +57,7 @@
                     <ColumnDefinition Width="Auto"/>
                     <ColumnDefinition/>
                 </Grid.ColumnDefinitions>
-                <ui:CircleImage Aspect="AspectFill" Source="xamarin_logo.png"
+                <ui:CircleImage Aspect="AspectFill" Source="logo_light.png"
                                HeightRequest="60" WidthRequest="60"
                                VerticalOptions="Center"/>
                 <Label Grid.Column="1" VerticalOptions="Center" FontAttributes="Bold"
diff --git a/Gallery.Share/Resources/UI/GalleryCollectionPage.cs b/Gallery.Share/Resources/UI/GalleryCollectionPage.cs
index 02f254f..e9beccd 100644
--- a/Gallery.Share/Resources/UI/GalleryCollectionPage.cs
+++ b/Gallery.Share/Resources/UI/GalleryCollectionPage.cs
@@ -458,7 +458,7 @@ namespace Gallery.Resources.UI
                 }
             }
             var list = collection.Where(i => i.PreviewImage == null).ToArray();
-            var task = ParallelTask.Start("collection.load", 0, list.Length, 2, i =>
+            var task = ParallelTask.Start("collection.load", 0, list.Length, Config.DownloadThreads, i =>
             {
                 if (!collection.Running)
                 {
@@ -468,11 +468,15 @@ namespace Gallery.Resources.UI
                 if (item.PreviewImage == null && item.PreviewUrl != null)
                 {
                     item.PreviewImage = Definition.DownloadBackground;
+#if DEBUG
+                    System.Threading.Thread.Sleep(500);
+#else
                     var image = Store.LoadPreviewImage(item.PreviewUrl, true, force: true).Result;
                     if (image != null)
                     {
                         item.PreviewImage = image;
                     }
+#endif
                 }
                 return true;
             }, tagIndex: tag);
diff --git a/Gallery.Share/Util/NetHelper.cs b/Gallery.Share/Util/NetHelper.cs
index d8cb58f..75ffced 100644
--- a/Gallery.Share/Util/NetHelper.cs
+++ b/Gallery.Share/Util/NetHelper.cs
@@ -185,7 +185,7 @@ namespace Gallery.Util
                 var data = new byte[size];
                 var task = new TaskCompletionSource<string>();
 
-                ParallelTask.Start($"download.async.{id}", 0, list.Count, 2, i =>
+                ParallelTask.Start($"download.async.{id}", 0, list.Count, Config.MaxThreads, i =>
                 {
                     var (from, to) = list[i];
                     using (var request = new HttpRequestMessage(HttpMethod.Get, url))
diff --git a/Gallery.Share/Util/Store.cs b/Gallery.Share/Util/Store.cs
index db2a86d..24a1f5c 100644
--- a/Gallery.Share/Util/Store.cs
+++ b/Gallery.Share/Util/Store.cs
@@ -81,7 +81,7 @@ namespace Gallery.Util
         public const string ProxyHostKey = "proxy_host";
         public const string ProxyPortKey = "proxy_port";
 
-        public const int MaxThreads = 8;
+        public const int MaxThreads = 2;
         public const string UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36";
         public const string AcceptLanguage = "zh-cn";
         public const string AcceptImage = "image/png,image/*,*/*;q=0.8";
diff --git a/Gallery.iOS/Gallery.iOS.csproj b/Gallery.iOS/Gallery.iOS.csproj
index cd6e8b4..7838a37 100644
--- a/Gallery.iOS/Gallery.iOS.csproj
+++ b/Gallery.iOS/Gallery.iOS.csproj
@@ -73,6 +73,7 @@
     <CodesignProvision>Gallery.Ad-Hoc</CodesignProvision>
     <MtouchLink>SdkOnly</MtouchLink>
     <LangVersion>9.0</LangVersion>
+    <MtouchUseLlvm>true</MtouchUseLlvm>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="Main.cs" />
@@ -110,9 +111,6 @@
     <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon167.png" />
     <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon180.png" />
     <ImageAsset Include="Assets.xcassets\AppIcon.appiconset\Icon1024.png" />
-    <BundleResource Include="Resources\xamarin_logo.png" />
-    <BundleResource Include="Resources\xamarin_logo%402x.png" />
-    <BundleResource Include="Resources\xamarin_logo%403x.png" />
     <BundleResource Include="Resources\fa-light-300.ttf" />
     <BundleResource Include="Resources\fa-regular-400.ttf" />
     <BundleResource Include="Resources\fa-solid-900.ttf" />
@@ -133,6 +131,9 @@
     <ImageAsset Include="Assets.xcassets\IconYandereRegular.imageset\yandere-regular.png" />
     <ImageAsset Include="Assets.xcassets\IconYandereRegular.imageset\yandere-regular%402x.png" />
     <ImageAsset Include="Assets.xcassets\IconYandereRegular.imageset\yandere-regular%403x.png" />
+    <BundleResource Include="Resources\logo_light.png" />
+    <BundleResource Include="Resources\logo_light%402x.png" />
+    <BundleResource Include="Resources\logo_light%403x.png" />
   </ItemGroup>
   <ItemGroup>
     <Reference Include="System" />
@@ -140,7 +141,6 @@
     <Reference Include="System.Core" />
     <Reference Include="Xamarin.iOS" />
     <Reference Include="System.Numerics" />
-    <Reference Include="System.Numerics.Vectors" />
     <Reference Include="System.Net.Http" />
   </ItemGroup>
   <ItemGroup>
@@ -155,6 +155,8 @@
     <Folder Include="Assets.xcassets\IconSource.imageset\" />
     <Folder Include="Assets.xcassets\IconYandereRegular.imageset\" />
     <Folder Include="Assets.xcassets\IconSourceRegular.imageset\" />
+    <Folder Include="Assets.xcassets\LaunchLogo.imageset\" />
+    <Folder Include="Assets.xcassets\LauncherLogo.imageset\" />
   </ItemGroup>
   <Import Project="..\Gallery.UI\Gallery.UI.projitems" Label="Shared" Condition="Exists('..\Gallery.UI\Gallery.UI.projitems')" />
   <Import Project="..\Gallery.Share\Gallery.Share.projitems" Label="Shared" Condition="Exists('..\Gallery.Share\Gallery.Share.projitems')" />
diff --git a/Gallery.iOS/Info.plist b/Gallery.iOS/Info.plist
index 8be52aa..1cbcd89 100644
--- a/Gallery.iOS/Info.plist
+++ b/Gallery.iOS/Info.plist
@@ -33,9 +33,9 @@
 	<key>XSAppIconAssets</key>
 	<string>Assets.xcassets/AppIcon.appiconset</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.0.805</string>
+	<string>1.0.811</string>
 	<key>CFBundleVersion</key>
-	<string>1</string>
+	<string>2</string>
 	<key>UIAppFonts</key>
 	<array>
 		<string>fa-light-300.ttf</string>
diff --git a/Gallery.iOS/Resources/LaunchScreen.storyboard b/Gallery.iOS/Resources/LaunchScreen.storyboard
index 4521891..91f72a7 100644
--- a/Gallery.iOS/Resources/LaunchScreen.storyboard
+++ b/Gallery.iOS/Resources/LaunchScreen.storyboard
@@ -1,7 +1,11 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6245" systemVersion="13F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="X5k-f2-b5h">
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="18122" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="X5k-f2-b5h">
+    <device id="retina6_0" orientation="portrait" appearance="light"/>
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6238"/>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="18093"/>
+        <capability name="System colors in document resources" minToolsVersion="11.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
         <!--View Controller-->
@@ -13,18 +17,21 @@
                         <viewControllerLayoutGuide type="bottom" id="9ZL-r4-8FZ"/>
                     </layoutGuides>
                     <view key="view" contentMode="scaleToFill" id="yd7-JS-zBw">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="812"/>
+                        <rect key="frame" x="0.0" y="0.0" width="390" height="844"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
-                        <color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
                         <subviews>
-                            <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFit" misplaced="YES" image="Icon-60.png" translatesAutoresizingMaskIntoConstraints="NO" id="23">
-                                <rect key="frame" x="59" y="356" width="60" height="60"/>
-                                <rect key="contentStretch" x="0.0" y="0.0" width="0.0" height="0.0"/>
+                            <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFit" image="logo_light.png" translatesAutoresizingMaskIntoConstraints="NO" id="23">
+                                <rect key="frame" x="165" y="392" width="60" height="60"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="60" id="41"/>
+                                    <constraint firstAttribute="width" constant="60" id="42"/>
+                                </constraints>
                             </imageView>
                         </subviews>
+                        <color key="backgroundColor" systemColor="systemBackgroundColor"/>
                         <constraints>
-                            <constraint firstItem="23" firstAttribute="centerY" secondItem="yd7-JS-zBw" secondAttribute="centerY" priority="1" id="39"/>
-                            <constraint firstItem="23" firstAttribute="centerX" secondItem="yd7-JS-zBw" secondAttribute="centerX" priority="1" id="41"/>
+                            <constraint firstItem="23" firstAttribute="centerY" secondItem="yd7-JS-zBw" secondAttribute="centerY" id="39"/>
+                            <constraint firstItem="23" firstAttribute="centerX" secondItem="yd7-JS-zBw" secondAttribute="centerX" id="40"/>
                         </constraints>
                     </view>
                 </viewController>
@@ -34,6 +41,9 @@
         </scene>
     </scenes>
     <resources>
-        <image name="Icon-60.png" width="180" height="180"/>
+        <image name="logo_light.png" width="60" height="60"/>
+        <systemColor name="systemBackgroundColor">
+            <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+        </systemColor>
     </resources>
 </document>
diff --git a/Gallery.iOS/Resources/logo_light.png b/Gallery.iOS/Resources/logo_light.png
new file mode 100644
index 0000000..8305eb8
Binary files /dev/null and b/Gallery.iOS/Resources/logo_light.png differ
diff --git a/Gallery.iOS/Resources/logo_light@2x.png b/Gallery.iOS/Resources/logo_light@2x.png
new file mode 100644
index 0000000..827f797
Binary files /dev/null and b/Gallery.iOS/Resources/logo_light@2x.png differ
diff --git a/Gallery.iOS/Resources/logo_light@3x.png b/Gallery.iOS/Resources/logo_light@3x.png
new file mode 100644
index 0000000..8f15b6d
Binary files /dev/null and b/Gallery.iOS/Resources/logo_light@3x.png differ
diff --git a/Gallery.iOS/Resources/xamarin_logo.png b/Gallery.iOS/Resources/xamarin_logo.png
deleted file mode 100644
index 7d5007d..0000000
Binary files a/Gallery.iOS/Resources/xamarin_logo.png and /dev/null differ
diff --git a/Gallery.iOS/Resources/xamarin_logo@2x.png b/Gallery.iOS/Resources/xamarin_logo@2x.png
deleted file mode 100644
index a5b9fc0..0000000
Binary files a/Gallery.iOS/Resources/xamarin_logo@2x.png and /dev/null differ
diff --git a/Gallery.iOS/Resources/xamarin_logo@3x.png b/Gallery.iOS/Resources/xamarin_logo@3x.png
deleted file mode 100644
index b36d00e..0000000
Binary files a/Gallery.iOS/Resources/xamarin_logo@3x.png and /dev/null differ