1845890 - Very high CPU usage when viewing SVG with animated filter

Status: NEW

(Core :: Graphics: WebRender, defect)

Description

[coles.david]

Steps to reproduce:

1. Start Firefox
2. Open about:processes
3. Open https://staging.cohostcdn.org/header/63299-4a022c5a-f433-4aea-92c8-3fe906bf0cdb-profile.svg in a new window

Actual results:

On Windows 11 64-bit (Version 10.0.22621 Build 22621) the GPU process immediately spikes to 600% (approximately 50% of total CPU resources on the system).

Looking at the CPU trace (https://share.firefox.dev/3Ox6fe5) it appears that most of the time is being split roughly between Skia rendering and the Turbulence filter software implementation:

• 35% BitmapProcShaderContext::shadeSpan (Skia)
• 29% mozilla::gfx::RenderTurbulence_SIMD

Expected results:

The same SVG image under Google Chrome Version 114.0.5735.248 (Official Build) (64-bit) only uses approximately 1.5% of total CPU resources on the system.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:gw, could you have a look please?

For more information, please visit BugBot documentation.

Comment 2

[Ashley Hale [:ahale]]

This uses feDisplacementMap which is not accelerated yet, so I'm marking it as dependent on the bug for implementing that feature.