This bug was originally marked as duplicate of bug 218828, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related.
Build: NetBeans IDE 7.3 Beta (Build 201210011125)
VM: OpenJDK 64-Bit Server VM, 23.2-b09, OpenJDK Runtime Environment, 1.7.0_07-b30
GUEST: user terminal
Maximum slowness yet reported was 5023 ms, average is 5023
Created attachment 126522 [details]
This bug is fixed in post-beta builds.