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This bug was originally marked as duplicate of bug 212105, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.0 (Build 201403101706) VM: Java HotSpot(TM) 64-Bit Server VM, 23.25-b01, Java(TM) SE Runtime Environment, 1.7.0_25-b17 OS: Windows 7 User Comments: GUEST: opening double window for the same file Maximum slowness yet reported was 48025 ms, average is 48025
Created attachment 147043 [details] nps snapshot
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