1754908 - DDG map panning and zooming has bad rendering performances on Firefox on Android

Status: RESOLVED DUPLICATE of bug 1753471

(Core :: Performance: Responsiveness, defect)

Description

[Karl Dubost💡 :karlcow]

[Tracking Requested - why for this release]: DDG is an important web property more likely to be used by Firefox users.

​​### Basic information

Steps to Reproduce:

1. Go to https://duckduckgo.com/?q=corse+&t=fpas&ia=about&iaxm=maps

Expected Results:
Smooth panning and zooming.

Actual Results:
When panning & zooming in Firefox, visual glitches can occur after giving only a few times of user inputs: tiles load in the wrong location, pinch-to-zoom snaps to one finger, creating a rubber band-like effect so the user is moved continents away. The experience is almost unusable.

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Performance recording (profile)

Profile URL:
https://share.firefox.dev/3oDsTnS

System configuration:

Tested with:
Browser / Version: Firefox Nightly 99.0a1 (🦎 99.0a1-20220209095640)
Operating System: Google Pixel 5 (Android 12) - 1080 x 2340 pixels, 19.5:9 ratio (~432 ppi density), Samsung Galaxy S8 (Android 9) - 1440 x 2960 pixels, 18.5:9 ratio (~570 ppi density)

More information

Note: The issue is not reproducible on Chrome.

The profile shows recurrent TOO_MUCH_MALLOC

Comment 1

[Pascal Chevrel:pascalc]

Tracking for our releases in flight as it affects a major site.

Comment 2

[Daniel Holbert [:dholbert]]

I can reproduce the janky behavior / worse-performance-than-Chrome when panning. I'm not seeing the visual glitches, but we should probably consider those a distinct bug from the perf issues anyway.

The profile shows lots of pretty-long requestAnimationFrame callbacks (100ms or more), and I think that slows down paints (we have to service the requestAnimationFrame before we paint, IIRC). e.g. here's a 96ms one:
https://share.firefox.dev/369Tnaf

It looks like it's spending a lot of time doing set HTMLImageElement.src... tnikkel, maybe you could take a look here?

Comment 3

[Timothy Nikkel (:tnikkel)]

I think the profile might be hitting bug 1753471. It was just fixed a day ago. Can you get a new profile with current nightly?

Comment 4

[Karl Dubost💡 :karlcow]

That seems to be working indeed. There is no glitch on my side.
https://share.firefox.dev/3IfQfrg

Comment 5

[Timothy Nikkel (:tnikkel)]

Okay, if it's fixed should we just resolve this then?

Comment 7

[dueltmp+x6xhz]

The performance on Android has improved slightly, but it is not noticeable by much on a midrange device

The Windows performance has actually degraded, having a high system load and spinning fans. The performance is terrible and the graphical corruption is also awful. Half of the screen is filled with blocks that are misplaced, like a mosaic.

Comment 8

[dueltmp+x6xhz]

Please see https://bugzilla.mozilla.org/show_bug.cgi?id=1758987 for rendering corruption part of bug