The time tracking wrappers were attaching on each run. I found no significant difference in perf results.
Created attachment 144010 [details] Patch
Comment on attachment 144010 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=144010&action=review > PerformanceTests/inspector/heap-snapshot.html:33 > + Revert this.
Committed r118496: <http://trac.webkit.org/changeset/118496>
(In reply to comment #2) > (From update of attachment 144010 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=144010&action=review > > > PerformanceTests/inspector/heap-snapshot.html:33 > > + > > Revert this. done