1479655 - Scrolling quickly sometimes makes the throbber paint the wrong frames

Status: RESOLVED DUPLICATE of bug 1481313

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

Description

[Jeff Muizelaar [:jrmuizel]]

This seems like a regression. I noticed this on https://www.bbc.com/news/world-europe-42157129 when scrolling quickly during loading.

Comment 1

[Mike Conley (:mconley) (:⚙️)]

I wonder if this is our schedule pressure thing. If you set browser.schedulePressure.enabled to false, do you still see this?

Comment 2

[Mike Conley (:mconley) (:⚙️)]

Apparently, Asa sees this occasionally too, so also ni?'ing him.

Comment 3

[Mike Conley (:mconley) (:⚙️)]

Hey jrmuizel, I suspect you didn't mean to clear the needinfo - if you still see this, does it persist if you flip that pref I mentioned in comment 1?

Comment 4

[Jeff Muizelaar [:jrmuizel]]

I did not. I haven't been seeing this as much lately.

Comment 5

[Asa Dotzler [:asa]]

Sorry for the late reply. I wanted to test with and without the suggested pref but I'm no longer seeing the stutter with either pref set or not. Sorry I couldn't help more. Will let you know if it returns.

Comment 6

[Jeff Muizelaar [:jrmuizel]]

I've seen this again.

Comment 7

[Hiroyuki Ikezoe (:hiro)]

I just realized that this is the exact case what I mentioned in bug 1481313 comment 21, the case is that we skip calling set_properties() since, IIRC, the throbber animation uses a step function for the animation-timing-function.

Feel free to reopen if someone still sees this.