On Sep 16, 2009, at 11:23 AM, Geoffrey Garen wrote:
Given some of our (Chromium-team) recent investigation into the
contents of unload handlers, I'm not sure how much this move will
help users, even if you don't revert it. Lots of unload handlers
busy-wait while doing async XHR in order to try to guarantee
delivery of tracking pings. Authors will probably elect to copy
this code to the pagehide handler rather than moving it, and the
experience for users is still going to be extremely sluggish
navigation out of these pages.
While it's great that you've made improvements for unload handlers
(or maybe not-so-great, since you made them only in v8),
I think a good way to deal with poorly written unload handlers is to
temporarily set the slow script timeout to a much lower value during
execution of unload. This would not require any JS-engine-specific
changes to work.
Regards,
Maciej
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