This issue was reported manually by thurka.
It already has 110 duplicates 


Build: NetBeans IDE 8.0.2 (Build 201411181905)
VM: Java HotSpot(TM) 64-Bit Server VM, 25.31-b07, Java(TM) SE Runtime Environment, 1.8.0_31-b13
OS: Mac OS X

User Comments:
cyhelsky: Invoking Select in projects on properties bundle

GUEST: At the moment that I clicked on some class to open it, I got this slowness...

lpweber: manipulation of files and folders caused netbeans to go > 100% on processor usage for more than 30 sec

GUEST: <Please provide a description of the problem or the steps to reproduce>
VERY SLOW OUT OF MEMORY

GUEST: Clicking on a file in Projects tab

minoleg: Clicking on a node in Projects tab.

GUEST: .

GUEST: LowPerformance

felipbou: Trying to copy a file

GUEST: Not sure if this helps much but here is what i have, The application has been in the background for a while and unused since i started using the computer, so it has been "sleeping" since i was on the computer 2 hours earlier. Then when i switched to it and was opening and clsing the arrows in the Projects Tab.. Then it happened

mkleint: expanding a folder

GUEST: it just froze as i was working.. i couldnt click anywhere

GUEST: Slowness collapsing/expanding project tree while 10+ tabs open.

guru4vedi: Trying to close a project tree and open another one.

GUEST: opening a java class file.

GUEST: Closing files

GUEST: it stoped working

GUEST: Was coding PHP. Made a simple code change and the IDE hung for a bit. I wasn't doing anything out of the ordinary, or anything that I haven't done before.  I was coding for over 4 hours...

GUEST: When i use the project explorer, the netbeans is too slow and with a very high processing.

GUEST: on mac pro 13.3 inch

GUEST: Lentid