This issue was reported manually by pjiricka.
It already has 2 duplicates
Build: NetBeans IDE Dev (Build EaselCSS-167-on-20120511)
VM: Java HotSpot(TM) 64-Bit Server VM, 23.0-b21, Java(TM) SE Runtime Environment, 1.7.0_04-b21
OS: Mac OS X
Maximum slowness yet reported was 5039 ms, average is 4678
Created attachment 119349 [details]
Debugger.addLineBreakpoint is setting sending blocking command to browser in AWT thread. Should probably use callback instead.
It is strange that it should take 5 seconds for your browser to respond to "addBreakpoint" command. I find communication with Chrome *instant* - as fast as embedded WebView. Could you keep an eye on this please and report back if your browser gets frequently slow. If it would help I can log time in WebKit Output window.
Integrated into 'main-golden', will be available in build *201209031048* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)
User: David Konecny <email@example.com>
Log: #212382 - LowPerformance took 5039 ms.