Open Bug 1907139 Opened 1 year ago Updated 1 year ago

Large images that are scaled down are slow to paint repeatedly with SWGL

Categories

(Core :: Graphics: WebRender, defect)

Product:
Core
Component:
Graphics: WebRender
Type:
defect

Tracking

()

People

(Reporter: mstange, Unassigned)

References

(Blocks 1 open bug)

Details

Scrolling pages with large downscaled pictures is sluggish on pages that don't benefit from picture caching.
Profile: https://share.firefox.dev/3W6a6BI

I noticed this on phanpy.social (see bug 1907137) but it's somewhat tricky to reproduce because of the dynamic content.

I wonder if WR could detect large downscale factors and cache the downscaled representation. Such an optimization could improve scrolling smoothness on both SWGL and on weak GPUs.

Blocks: sw-wr-perf
Severity: -- → S3
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