This bug was originally marked as duplicate of bug 243379, 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 201504170001)
VM: Java HotSpot(TM) 64-Bit Server VM, 25.0-b70, Java(TM) SE Runtime Environment, 1.8.0-b132
OS: Windows 8
GUEST: waiting for autocomplete, Netbeans simply froze. Was trying to autocomplete an object method.
Maximum slowness yet reported was 19000 ms, average is 19000
Created attachment 153875 [details]
*** This bug has been marked as a duplicate of bug 251825 ***