1392671 - Website with blur paints very slowly

Status: NEW

(Core :: Web Painting, enhancement, P3)

Description

[:Felipe Gomes (needinfo for replies!)]

Attachment: blur-stack.txt

This example URL [1] has a blur applied to a div that comprises the entire page, as well as some extra blur applied in some paragraphs, and it also uses opacity.

We spend a lot of time painting it, slowing the content process significantly. APZ scrolls smoothly, but it leads to a lot of checkerboarding while the painting is catching up.

I'm attaching here a process sample taken with the Activity Monitor on Mac.


I don't know if it's the blur filter itself, or a combination of things. I haven't tested with WebRender


[1] https://www.theguardian.com/science/2017/aug/21/solar-eclipse-eye-damage