1951042 - Testcase from bug 1945382 gets superlinearly slower compared to Chrome - 44x for N=100k, 98xfor N=200k, 195x for N=300K

Status: RESOLVED WONTFIX

(Core :: CSS Parsing and Computation, enhancement)

Description

[Mayank Bansal]

Attachment: nested stylesheet_no BLOB.HTML

1. Open the attached testcase (Original testcase from bug 1945382)
2. Enter 100k and press apply
3. Wait for the stylesshets to be generated and applied. We are faster than Chrome here \o/
4. Now without reloading the page or anything, enter 1 and press Apply.
5. Wait for the stylesshet to be applied - > This steps is very slow.

N=100K (44x slower)

• Nightly: https://share.firefox.dev/3XnnC54 (7s)
• Chrome: https://share.firefox.dev/3CXFcG8 (160ms)

N=200K (98x slower)

• Nightly: https://share.firefox.dev/3DnrBb3 (41s)
• Chrome:https://share.firefox.dev/4hVZcrz (420ms)

N=300K (195x slower)

• Nightly: https://share.firefox.dev/3CZEDM1 (103s)
• Chrome: https://share.firefox.dev/3QBOWbY (530ms)

Comment 1

[Emilio Cobos Álvarez [:emilio]]

Yeah so the test-case is removing from the front which is not particularly amazing. We could perform some sort of batching, but not clear that'd be faster for the common cases either tbh. So probably wontfix unless we see this show up in real websites.

Comment 2

[Mayank Bansal]

Thanks for checking Emilio.

Comment 3

[Mayank Bansal]

Profile: https://share.firefox.dev/4uMGR6C