This bug was originally marked as duplicate of bug 183962, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related.
Build: NetBeans IDE 7.4 Beta (Build 201307092200)
VM: Java HotSpot(TM) Client VM, 24.0-b56, Java(TM) SE Runtime Environment, 1.7.0_40-b43
OS: Windows 7
GUEST: Netbea takes huge memory and slow performance
Maximum slowness yet reported was 14556 ms, average is 14556
Created attachment 141903 [details]