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Steps to reproduce: 1) Open heapdump from exception report http://statistics.netbeans.org/analytics/exception.do?id=821777 2) Overview page is displayed after a long time (it takes 50 sec in my setup).
Normally Overview page is displayed almost instantly. Most of the time is spent in org.netbeans.modules.profiler.heapwalk.OverviewController.getOOMEThread() method. It takes a long time in this particular case, because tested heap dump contains a huge number of running threads (>11,000) and there a lot of stackframes.
Fixed in profiler-main changeset: 298343:d4fe945ba36c user: Tomas Hurka <thurka@netbeans.org> date: Fri Jun 24 22:14:14 2016 +0200 summary: bugfix #262551, speedup of getStackTraceBySerialNumber(), getStackFrameByID(), getClassNameBySerialNumber() Overview is now displayed in 2 sec.
Integrated into 'main-silver', will be available in build *201606290002* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-silver/rev/d4fe945ba36c User: Tomas Hurka <thurka@netbeans.org> Log: bugfix #262551, speedup of getStackTraceBySerialNumber(), getStackFrameByID(), getClassNameBySerialNumber()