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 (Build 201310111528)
VM: Java HotSpot(TM) Client VM, 23.21-b01, Java(TM) SE Runtime Environment, 1.7.0_21-b11
OS: Windows 7
GUEST: Using autocomplete for PHPExcel setValueExplicit
Maximum slowness yet reported was 53501 ms, average is 53501
Created attachment 142417 [details]
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue.
Thanks for your cooperation,
NetBeans IDE 8.2 Release Boss