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This bug was originally marked as duplicate of bug 193939, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.3 (Build 201302132200) VM: Java HotSpot(TM) 64-Bit Server VM, 20.14-b01, Java(TM) SE Runtime Environment, 1.6.0_41-b02 OS: Windows 7 Maximum slowness yet reported was 26583 ms, average is 26583
Created attachment 132396 [details] nps snapshot
slowness may be expected as quite big libraries may be loaded at runtime, the only problem is ui is frozen for some time.
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