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Issue 681739 link

Starred by 1 user
Status: WontFix
Owner: ----
Closed: Jan 2017
Cc:
█ hpayer@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Mac
Pri: 3
Type: Bug



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scrolling causes 500ms GCs

Project Member Reported by ojan@chromium.org, Jan 17 2017 
Chrome Version       : 57.0.2980.0
OS Version: OS X 10.12.2

What steps will reproduce the problem?
1. Go to https://www.nytimes.com/2017/01/09/opinion/deficits-matter-again.html?action=click&contentCollection=opinion&module=NextInCollection&region=Footer&pgtype=article&version=column&rref=collection%2Fcolumn%2Fpaul-krugman
2. Scroll up and down quickly.

Once every ~10 seconds, there's a 500ms GC that janks the scroll.

1. Why is the scrolling main thread?
2. Why do the GCs take so long?

Comment 1 by ojan@chromium.org, Jan 17 2017 

Turns out you don't need to scroll. Just leaving the page open gets the big GCs. Attaching a devtools timeline.
Profile-20170116T204340
21.9 MB Download

Comment 2 by ojan@chromium.org, Jan 17 2017

Status: WontFix (was: Untriaged)
Sigh. Doesn't reproduce on reload, so it was probably an ad. Incidentally, I didn't capture the trace, but ie took 3 seconds in onbeforeunload and literally all the time went to clearing timers. Clearing some ad or experiement on the page was doing something crazy.
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