1308229 - choppy animation at https://codepen.io/thebabydino/full/LRZvdN/

Status: NEW

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

Description

[Asa Dotzler [:asa]]

From twitter thread https://twitter.com/anatudor/status/784016899722113026 I tested https://codepen.io/thebabydino/full/LRZvdN/ and it is indeed choppy in Firefox and smoother in Chrome.

Comment 1

[Jamie Nicol [:jnicol]]

Each hex tile is 3d transformed, so this generates a crazy number of layers. Most of which seem to be optimised to colour layers so there probably isn't that much painting going on. So the slowness might come from the compositor side, or from actually sending that many layers to the compositor.

Comment 2

[Jamie Nicol [:jnicol]]

Attachment: layer-dump.txt

Here's a layer dump. Trying to get a profile but having some problems with the profiler.

Comment 3

[Jamie Nicol [:jnicol]]

Attachment: profile

The profile shows we spend a lot of time in FrameLayerBuilder, and a lot of time in ForwardTransaction

Comment 4

[Jeff Muizelaar [:jrmuizel]]

On the compositor time we're spending time all over the place. Some low hanging fruit is probably available in LayerPropertiesBase::ComputeDifferences() - 12.3% and LayerManagerComposite::PostProcessLayers() - 11.6%

Comment 6

[Gregory Pappas [:gregp]]

This is still slow
https://share.firefox.dev/3EMO9QE