This issue was reported manually by misterm.
It already has 7 duplicates 


Build: NetBeans IDE Dev (Build 20160509-a7eb2f145d54)
VM: Java HotSpot(TM) 64-Bit Server VM, 25.66-b17, Java(TM) SE Runtime Environment, 1.8.0_66-b17
OS: Windows 8.1

User Comments:
GUEST: Trying load libraries

misterm: .

GUEST: During the addition of Maven Dependencies, as I was digiting the Group ID, it took too long to show something. I did it again and again and the problem was the same

GUEST: I was manually adding a maven dependency.  I tried to start typing com. in the groupId field, and the dialog froze up while it looked up every single groupId starting with 'c'.

jglick: Adding a dependency on an open Maven project. Started to replace ${project.groupId} with the literal text, but upon typing ?o? the IDE froze and I could not cancel the completion task.

zmirc: Inside a Java Maven project, I was in pom.xml, pressed ALT + INSERT to add a new dependency, then started writing in the first field (groupId) in order to find what I was looking for.
The form froze and I pressed escape and cancel in order to get rid of it, but I still had to wait several seconds.



Maximum slowness yet reported was 23905 ms, average is 12875