This bug was originally marked as duplicate of bug 181584, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related.
Build: NetBeans IDE 8.0.2 (Build 201411181905)
VM: Java HotSpot(TM) 64-Bit Server VM, 25.31-b07, Java(TM) SE Runtime Environment, 1.8.0_31-b13
OS: Windows 7
GUEST: System was unresponsive while editing
Maximum slowness yet reported was 28448 ms, average is 28448
Created attachment 152744 [details]
Most of time is spent in sun.awt.Win32GraphicsDevice.getConfigurations().
*** This bug has been marked as a duplicate of bug 227232 ***