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This bug was originally marked as duplicate of bug 254649, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.2 (Build 201609300101) VM: Java HotSpot(TM) Client VM, 25.111-b14, Java(TM) SE Runtime Environment, 1.8.0_111-b14 OS: Windows 10 User Comments: GUEST: problem while javafx Maximum slowness yet reported was 23685 ms, average is 23685
Created attachment 164452 [details] nps snapshot
As can be seen from the attached profiler snapshot, an extremely slow GenerateControllerAction is called from the AWT event thread.