This bug was originally marked as duplicate of bug 211288, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related.
Build: NetBeans IDE Dev (Build 20120803-5923b60a5513)
VM: Java HotSpot(TM) Client VM, 23.1-b03, Java(TM) SE Runtime Environment, 1.7.0_05-b05
Maximum slowness yet reported was 46876 ms, average is 46876
Created attachment 122703 [details]
fixed, change set:
Integrated into 'main-golden', will be available in build *201208040001* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)
User: Alexander Simon <email@example.com>
Log: fixed Bug #216350 LowPerformance took 46876 ms.