1466505 - WWDC 2018 site’s performance is horrible in Firefox Nightly compared to release Safari or Chrome

Status: RESOLVED FIXED

(Core :: Graphics, defect, P5)

Description

[Robin Whittleton]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:62.0) Gecko/20100101 Firefox/62.0
Build ID: 20180603221731

Steps to reproduce:

Visited the new WWDC 2018 site: https://developer.apple.com/wwdc/


Actual results:

On first load I was getting very low fps on the video, then it took over a second to render text when scrolling down the page.


Expected results:

Chrome and Safari render this at at least 30fps, if not more, on my 2017 15" Macbook Pro.

Looking into the performance monitor, each paint during the video is taking over 100ms, and when scrolling down paint is taking anywhere between 350ms and 450ms per frame. I am running my main display scaled by one notch down if that makes any difference. Chrome’s paint during the scroll was 10ms for reference. This is with the default pipeline, not WebRender, on latest Nightly.

Comment 1

[Robin Whittleton]

Just tested with WebRender turned on and performance is back up to Chrome levels. So I guess the easiest fix would just be to push WebRender out to release :)

Comment 2

[Matt Woodrow (:mattwoodrow)]

Super slow painting, all the time spent painting filters. We don't have accelerated filters on OSX (without WR), so this is 'expected' to be slow.

Comment 3

[Aria Beingessner [:Gankra]]

Do we have plans to fix this other than shipping WR?

Comment 4

[Gregory Pappas [:gregp]]

Performs well now.