optimized performance

src/Shared/HandyControl_Shared/Tools/Helper/ConfigHelper.cs

@@ -6,6 +6,7 @@ using System.Runtime.CompilerServices;
 #endif
 using System.Windows;
 using System.Windows.Markup;
+using System.Windows.Media.Animation;
 using HandyControl.Controls;
 using HandyControl.Data;
 
@@ -50,8 +51,12 @@ namespace HandyControl.Tools
         {
             SetSystemVersionInfo(config.SystemVersionInfo);
             SetLang(config.Lang);
+            SetTimelineFrameRate(config.TimelineFrameRate);
         }
 
+        public void SetTimelineFrameRate(int rate) => 
+            Timeline.DesiredFrameRateProperty.OverrideMetadata(typeof(Timeline), new FrameworkPropertyMetadata(rate));
+
         public void SetWindowDefaultStyle(object resourceKey = null)
         {
             var metadata = resourceKey == null