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This issue was reported manually by alexvsimon. It already has 3 duplicates Build: NetBeans IDE 7.3 RC1 (Build 20130125-0fbf0f6115da) VM: Java HotSpot(TM) Client VM, 23.6-b04, Java(TM) SE Runtime Environment, 1.7.0_11-b21 OS: SunOS User Comments: alexvsimon: a lot of sloness while background scanning of projects Maximum slowness yet reported was 28619 ms, average is 12398
Created attachment 130618 [details] nps snapshot
This is caused because ClassPath.getClassPath method was called from EDT and should be fixed by http://hg.netbeans.org/core-main/rev/07d0a71ed965. Please try a latest build and reopen if there is still an issue for you. Thank you