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UI freeze monitor embedded in our RCP application detects UI freeze for 1~7s. All are logged with win32.OS methods. According to doc, these are native method and calls Windows for painting and drawing. I am not sure how could the application causing a 7s method call down to the system. Any advice is greatly appreciated. A few examples attached below. 1) 7s on OS.PatBlt !MESSAGE UI freeze of 7.0s at 10:47:41.624 !SUBENTRY 1 org.eclipse.ui.monitoring 1 0 2022-03-01 10:47:48.604 !MESSAGE Sample at 10:47:43.879 (+2.255s) Thread 'main' tid=1 (RUNNABLE) !STACK 0 java.lang.Exception: Stack Trace at org.eclipse.swt.internal.win32.OS.PatBlt(Native Method) at org.eclipse.swt.graphics.GC.fillRectangle(GC.java:3039) at org.eclipse.swt.graphics.GC.fillRectangle(GC.java:3059) 2) 7s on OS.DrawTextW !MESSAGE UI freeze of 7.1s at 10:49:24.904 !SUBENTRY 1 org.eclipse.ui.monitoring 1 0 2022-03-01 10:49:31.969 !MESSAGE Sample at 10:49:27.014 (+2.110s) Thread 'main' tid=1 (RUNNABLE) !STACK 0 java.lang.Exception: Stack Trace at org.eclipse.swt.internal.win32.OS.DrawTextW(Native Method) at org.eclipse.swt.internal.win32.OS.DrawText(OS.java:2579) at org.eclipse.swt.graphics.GC.textExtent(GC.java:5035) at org.eclipse.swt.graphics.GC.textExtent(GC.java:4979)
You are using a very old version of Eclipse, first suggestion would be to update to a newer version. Secondly, as you are running on Windows 10, are you running Windows Defender? It is know to cause performance issues. See the note and workaround on the New and Noteworthy page, this applies to any Eclipse version https://www.eclipse.org/eclipse/news/4.23/