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This bug was originally marked as duplicate of bug 210435, 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, 24.51-b03, Java(TM) SE Runtime Environment, 1.7.0_51-b13 OS: Windows 7 User Comments: GUEST: Everyday it goes slower and slower working with Swing applications Maximum slowness yet reported was 77730 ms, average is 77730
Created attachment 147614 [details] nps snapshot
I guess caching org.netbeans.modules.swingapp.AppFrameworkSupport.getApplicationClassName() 19.618101 13 272 ms (19,6%) 13 262 ms 53 to not touch the disk would help significantly.
I'm sorry but the Swing App Framework is not supported by NetBeans anymore.