improve:白板翻页性能

Ink Canvas/MainWindow_cs/MW_BoardControls.cs

@@ -163,7 +163,6 @@ namespace Ink_Canvas
         /// <remarks>
         /// - 根据参数设置当前提交类型
         /// - 清除画布上的所有墨迹
-        /// - 执行轻量级内存清理
         /// - 恢复当前提交类型为用户输入
         /// </remarks>
         private void ClearStrokes(bool isErasedByCode)
@@ -173,23 +172,9 @@ namespace Ink_Canvas
 
             inkCanvas.Strokes.Clear();
 
-            // 执行内存清理
-            PerformLightweightMemoryCleanup();
-
             _currentCommitType = CommitReason.UserInput;
         }
 
-        /// <summary>
-        /// 执行内存清理
-        /// </summary>
-        private void PerformLightweightMemoryCleanup()
-        {
-            Task.Run(() =>
-            {
-                GC.Collect();
-            });
-        }
-
         private static HashSet<UIElement> CollectRemovedElementsFromHistory(TimeMachineHistory[] history)
         {
             var set = new HashSet<UIElement>();

Ink Canvas/MainWindow_cs/MW_Timer.cs

@@ -556,10 +556,12 @@ namespace Ink_Canvas
 
                 if (arg != "/F")
                 {
-                    var p = new Process();
-                    p.StartInfo = new ProcessStartInfo("taskkill", arg);
-                    p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
-                    p.Start();
+                    using (var p = new Process())
+                    {
+                        p.StartInfo = new ProcessStartInfo("taskkill", arg);
+                        p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
+                        p.Start();
+                    }
 
                     if (arg.Contains("EasiNote"))
                     {