1972315 - Testcase resizing a png N times is 9x slower in Firefox compared to Chrome (spending a lot of time around style)

Status: NEW

(Core :: CSS Parsing and Computation, defect)

Description

[Mayank Bansal]

Attachment: Resize Image.html

Open testcase
Enter 50000
Click Run

Chrome: https://share.firefox.dev/3TrLfHk (4s)
Firefox Samply: https://share.firefox.dev/405Hqv6 (34s)
Firefox gecko profiler (5000): https://share.firefox.dev/45vG7JL

Comment 1

[Emilio Cobos Álvarez [:emilio]]

This test-case becomes much faster if we don't restyle the scrollbars and (you add <style>:root { overflow: hidden }</style> or so). That's causing comparatively a lot of extra work, but it's unrelated to resizing an image.

Comment 2

[Mayank Bansal]

so, is this big worth keeping open? I am happy to close as WOntFIX/INVALID.

Comment 3

[Mayank Bansal]

"styling scrollbars" sounds a lot like bug 1943862... Feel free to dupe if appropriate.

Comment 4

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

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

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