1373759 - Scrolling performance unusably bad on https://www.playstation.com/en-us/games/horizon-zero-dawn-ps4

Status: RESOLVED WORKSFORME

(Core :: Graphics: Layers, defect, P3)

Description

[James Willcox (:snorp) ([e-mail]) (he/him)]

The page takes forever to load, but even then it's impossible to ever scroll smoothly.

Comment 1

[James Willcox (:snorp) ([e-mail]) (he/him)]

Attachment: Fennec 2017-06-16 12.58 profile.sps.json

Here's a profile. You can view it directly at https://perf-html.io/public/f492ec73bccd34fb59786ca2daff64e03c5cb6ab/calltree/?thread=0

The compositor spends all of it's time uploading. The content thread spends most of it's time painting (mostly in ValidateTile?) or running scripts.

Comment 2

[James Willcox (:snorp) ([e-mail]) (he/him)]

This was on a Nexus 6P. Oddly on my Pixel it seems much better.

Comment 3

[Milan Sreckovic [:milan] (needinfo for best results)]

Recent regression?

Comment 4

[Jamie Nicol [:jnicol]]

When the content process is spending most time memsetting in ValidateTile, and the compositor is spending most time uploading textures, that could mean that the entire layer is being invalidated frequently. That was the case in bug 1360306 which I looked at recently.

Comment 5

[Jamie Nicol [:jnicol]]

Yeah this is awful. I don't know what they're doing but there are a lot of layers, and large parts of the page switch between layers whilst scrolling, requiring them to be repainted frequently

Comment 6

[James Willcox (:snorp) ([e-mail]) (he/him)]

I think it's probably not a recent regression.

Comment 7

[Milan Sreckovic [:milan] (needinfo for best results)]

Mike, is there any evangelism we can do here?

Comment 8

[Jamie Nicol [:jnicol]]

I'll investigate a bit further so we can check if we're doing anything stupid and/or have something more specific to evangelize.

Comment 9

[Mike Taylor [:miketaylr]]

(In reply to Jamie Nicol [:jnicol] from comment #8)
> I'll investigate a bit further so we can check if we're doing anything
> stupid and/or have something more specific to evangelize.

That would be great -- the more specific we can be the better. Please ni? again (or move to Tech Evangelism::Desktop) if we end up there, thanks!

Comment 10

[Jamie Nicol [:jnicol]]

This is much better now, presumably fixed by webrender