[Webkit-unassigned] [Bug 99939] should disallow gc/layout/stylerecalc in beforeunload/unload handlers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=99939





--- Comment #3 from Ojan Vafai <ojan at chromium.org>  2012-10-22 15:55:22 PST ---
(In reply to comment #1)
> Do users actually complain about page closing being slow?

Yes. Also, we have data that ~5% of unload handlers take >449ms to run. ~2% hit the 1 second time limit that chromium enforces when it can (e.g. when closing the tab or when doing a cross-process navigation). Of the ones that don't get killed, some take longer than 10 seconds to run.

It's not clear to me that the cost here is at all related to gc/layout/stylerecalc though. The first step towards addressing this bug would be to add measurements so we can see if there would be any real benefit from doing this.

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