1470219 - Scrolling jank with webrender and large SVG

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, defect, P2)

Description

[Stuart Philp :sphilp]

Happening at least on OSX 10.13.4, todays nightly (62.0a1 (2018-06-21) (64-bit))

Confirmed to be webrender only (doesn't happen when I disabled gfx.webrender.all)

Steps:

1. Load http://jlongster.com:8080/s/bigsvg/
2. Scroll down the page
3. Once you get near the bottom (where the bubbles start to fan/thin out), scrolling appears to drop frames/jank

Profile captured at: https://perfht.ml/2Kansq3

Kats suggested this may be fixed by bug 1455422

Comment 1

[Stuart Philp :sphilp]

Also this didn't seem to be a problem for me on my external monitor (24" 1080p), but it is very noticeable on my 13" retina display. I thought it may be related to high dpi, but changing the system display scaling didn't seem to help.

Comment 2

[Jeff Muizelaar [:jrmuizel]]

How does this feel now?

Comment 3

[Stuart Philp :sphilp]

Seems about the same, as of 63.0a1 (2018-08-13) (64-bit), still stutters when scrolling down

Comment 4

[Michal Čaplygin [:myf]]

I cannot quite reproduce aforementioned jank on the test page but I've just encountered something that fits the description at https://www.bbc.co.uk/radio: all SVGs move "strange" during scroll: mostly faster than rest of page (on sub-pages slower), some even in wrong direction (presumably due transforms).  But jumps to proper place after scrolling finishes.

Behold the amusing showcase: https://imgur.com/a/s6IhvtO

Comment 5

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

That's bug 1496416.

Comment 6

[Jeff Muizelaar [:jrmuizel]]

I'm duping against 1391838

Comment 7

[Markus Stange [:mstange]]

This still doesn't seem ideal. There are still invalidations during scrolling (can be seen with gfx.webrender.blob.paint-flashing).

The new URL is https://jlongster.com/s/bigsvg/

Comment 8

[Markus Stange [:mstange]]

Attachment: testcase

Comment 9

[Jeff Muizelaar [:jrmuizel]]

This appears to be fixed by bug 1582152.

Comment 10

[Michel Le Bihan]

I can't reproduce on 74.0 (current release).

Comment 11

[Nicolas Silva [:nical]]

Closing per comments 9 and 10.