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This issue was reported manually by KhArtNJava. It already has 1 duplicates Build: NetBeans IDE Dev (Build 201309060001) VM: Java HotSpot(TM) Client VM, 23.25-b01, Java(TM) SE Runtime Environment, 1.7.0_25-b17 OS: Windows Server 2008 User Comments: KhArtNJava: ?????? Maximum slowness yet reported was 3751 ms, average is 3751
Created attachment 140166 [details] nps snapshot
The report shows that one call to undo() yields 339 calls to org.netbeans.editor.BaseDocument.fireInsertUpdate() 7 655 ms 693644
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss