We have two log post processing operations on the heap snapshot. The first one is buildAggregates for Summary view, the second one is the buildRetainers. The users feel bad when they wait for Summary view for 20 sec and after first click wait another 20 sec for the retainers tree.
Created attachment 132271 [details] Patch
Committed r111003: <http://trac.webkit.org/changeset/111003>