1293527 - firefox 48 "beach ball" for many seconds on foxnews.com load (non-e10s)

Status: NEW

(Core :: Web Painting, defect)

Description

[Ben Kelly [:bkelly, not reviewing]]

STR:

1) Open firefox 48 on a mac (e10s disabled)
2) Open foxnews.com in a tab
3) Watch the cursor turn into a beach ball for many seconds as the page loads.
4) Observe that you cannot scroll the page during this period.

In addition, scrolling the page after the beach ball goes away is extremely janky.

Comment 1

[Ben Kelly [:bkelly, not reviewing]]

Andrew, this is a very high profile site.  How do I get it into the list of sites to investigate for perf issues?

Comment 2

[Ben Kelly [:bkelly, not reviewing]]

Also, you should probably make sure you don't have tracking protection enabled when trying to reproduce.  I expect a lot of this is due to loading ads, videos, etc.  Still, our current default user experience is absolutely unusable on this high profile site.

Comment 3

[Andrew Overholt [:overholt]]

Bobby/Dees, who decides on Hasal's list?

Comment 4

[Ben Kelly [:bkelly, not reviewing]]

Note, I could not reproduce this on windows today.  It seems to be mac specific.

Comment 5

[Desigan Chinniah [:cyberdees] [:dees] [London - GMT]]

(In reply to Andrew Overholt [:overholt] from comment #3)
> Bobby/Dees, who decides on Hasal's list?

Likely jst. I've added input based on our list of Platform Relations priorities. But that's just input. I can say that Fox isn't on that list - but that doesn't mean that it shouldn't be.

Comment 6

[Andrew Overholt [:overholt]]

Johnny, see comment 1.

Comment 7

[Ben Kelly [:bkelly, not reviewing]]

Note, one way to attack this would be to prioritize mac during the e10s rollout.  It seems to benefit disproportionately from APZC+e10s due to its high pixel densities.

Comment 8

[Johnny Stenback (:jst)]

If this is effectively fixed by e10s then I don't think there's anything we can realistically do in a shorter time frame than e10s naturally rolling out. We could possibly be more aggressive on mac, yes, but that has other consequences as well. Brad, what's our expected e10s penetration on Mac by the end of 48? Addons still weigh into that, a11y less so than Windows I'd imagine.

Comment 9

[Brad Lassey [:blassey] (use needinfo?)]

(In reply to Johnny Stenback  (:jst, [e-mail]) from comment #8)
> If this is effectively fixed by e10s then I don't think there's anything we
> can realistically do in a shorter time frame than e10s naturally rolling
> out. We could possibly be more aggressive on mac, yes, but that has other
> consequences as well. Brad, what's our expected e10s penetration on Mac by
> the end of 48? Addons still weigh into that, a11y less so than Windows I'd
> imagine.

Yup, we only have addons to contend with on Mac. Unfortunately, we're having severe performance issues right now with our telemetry databases so I can't get an exact number. However, according to this blog post [1] by fligtar 7 years ago (and why would the data have changed since then??), 33% of our users have addons, which means 67% of mac users will get e10s by the end of 48.

[1] https://blog.mozilla.org/addons/2009/08/11/how-many-firefox-users-use-add-ons/

Comment 10

[Emil Pasca [:emilpasca]]

User Agent  Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:51.0) Gecko/20100101 Firefox/51.0

I have tested this issue on Mac OS X 10.10 with the latest Firefox release (48.0) and the latest Nightly (51.0a1-20160811030201).
After open foxnews.com website in a tab, when scrolling the page during the cursors is turned into a beach ball the page loads properly no hangs or other issues.
However when testing the same steps using Nightly with e10s disabled/enabled, I have encountered multiple crashes.
This is the last report ID: bp-2b0173ea-2d3b-4f7e-abcd-768b22160812

Comment 11

[Ben Kelly [:bkelly, not reviewing]]

(In reply to Emil Pasca [:emilpasca] from comment #10)
> This is the last report ID: bp-2b0173ea-2d3b-4f7e-abcd-768b22160812

That appears to be bug 1294159.  Looks like a FF51 regression and probably unrelated to the original issue here.