1533135 - Scrolling on bing images search results is sluggish

Status: NEW

(Core :: Graphics: WebRender, enhancement, P3)

Description

[Kartikaya Gupta (email:[e-mail])]

I was scrolling up and down on https://www.bing.com/images/search?q=mediterranean+diet&FORM=HDRSC2 and it seemed extra sluggish.

Profile is https://perfht.ml/2SPnuay

Content process is pretty swamped, mostly building the DL and WRDL. A lot of time in memcpy. Might be some things we can improve there.

Comment 1

[Kris Taeleman (:ktaeleman)]

@jamie: Can you do a quick profile on Mali-G and T?

Comment 2

[Jamie Nicol [:jnicol]]

Profiled on Samsung Galaxy S9 (Mali-G72) and Samsung A5 2017 (Mali-T830), as well as a Pixel 2 (Adreno 540) for comparison. I think the original device was the Kindle Fire (Mali 400)

Profile shows a lot of activity during display list building, like in comment 0. Scrolling feels fine on S9 and Pixel, less so on A5. Renderer thread looks fine on Pixel and S9, but less good on A5 (albeit better than the original profile). I think it probably struggles because the main thread is so busy.

We should figure out why display list building is taking so much time. Definitely no need to block Mali-G on this, but worth tracking for Mali-T. Not because I think there's anything GPU specific, but because of the typical CPU power on those.

Mali-T profile: https://share.firefox.dev/2RKLzkD