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This bug was originally marked as duplicate of bug 239215, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.1 Beta (Build 201508041349) VM: Java HotSpot(TM) 64-Bit Server VM, 25.60-b23, Java(TM) SE Runtime Environment, 1.8.0_60-b27 OS: Mac OS X User Comments: GUEST: <Please provide a description of the problem or the steps to reproduce slow Maximum slowness yet reported was 10178 ms, average is 10178
Created attachment 156319 [details] nps snapshot
There are 2 problems: 1st) The CSS calls index + parser from EDT 2nd) The CSSUpdater ignores cancel. Both of them should be resovled