1945382 - Testcase generating N "nested" stylesheets is 117x slower in Nightly for N=10000.

Status: RESOLVED DUPLICATE of bug 1931789

(Core :: CSS Parsing and Computation, enhancement)

Description

[Mayank Bansal]

Attachment: nested stylesheet_no BLOB.HTML

Two testcases. 10K input value.

No-Blob Testcase:

• Nightly: https://share.firefox.dev/4aPuFsT (53s)
• Chrome: https://share.firefox.dev/4jJ9sVu (450ms)

Blob Testcase:

• Nightly: https://share.firefox.dev/3EfUuWM (85s)
• Chrome: https://share.firefox.dev/4aZstiN (13s)

Chrome also throws an error on loading the testcases
Uncaught ReferenceError: attachShadow is not defined at <anonymous>:1:1

Testcase created by chatgpt based on my prompts. Definitely not realistic. As usual, feel free to WONTFIX/INVALID.
Also, I am aware that the bug title is clickbait :P

Comment 1

[Mayank Bansal]

Attachment: nested stylesheet - blob.HTML

Comment 2

[Mayank Bansal]

(In reply to Mayank Bansal from comment #0)

Created attachment 9463371 [details]
nested stylesheet_no BLOB.HTML

Two testcases.

Open the "no-blob" testcase
Input 10k and press enter

Nightly: https://share.firefox.dev/4aPuFsT (53s)
Chrome: https://share.firefox.dev/4jJ9sVu (450ms)

Chrome also throws an error on loading the testcase
Uncaught ReferenceError: attachShadow is not defined at <anonymous>:1:1

Testcase created by chatgpt based on my prompts. Definitely not realistic. As usual, feel free to WONTFIX/INVALID.

ni? for this.

Comment 3

[Emilio Cobos Álvarez (:emilio)]

I don't get the "nested" bit, this is just appending N stylesheets...

But, this is basically bug 1931789, aiui.