1925065 - Nightly is 2.4x slower than Chrome on an online demo (https://www.compresh.dev/) and uses more memory

Status: NEW

(Core :: JavaScript Engine, task, P3)

Description

[Mayank Bansal]

Attachment: sample text.txt

Go to https://www.compresh.dev/
Delete the text in the left-pane
Slide the compression level slider all the way to the right (=9)
Copy-paste the attached sample text

Chrome: https://share.firefox.dev/403Wg6b (1.3s)
Nightly: https://share.firefox.dev/4f2nFK2 (3.2s)

Comment 1

[Mayank Bansal]

Attachment: memory-report.json.gz

Comment 2

[Mayank Bansal]

Chrome used ~400MB memory for the tab.
On a larger sample input, Chrome took 1.2GB and Firefox took 2GB.

Comment 3

[Jan de Mooij [:jandem]]

A lot of time under Map.prototype.set, a lot of it comparing Values?

Also Set construction shows up. That's bug 1851662.

Comment 4

[Mayank Bansal]

Profile with latest Nightly containing the fix from bug 1927464 and bug 1927405 : https://share.firefox.dev/3YY1gIO (3.2s)

Comment 5

[Mayank Bansal]

Profile with patches containing fix from bug 1928666: https://share.firefox.dev/3YQ6N2O (3s)

Comment 6

[Mayank Bansal]

Profile with fixes from bug 1931815: https://share.firefox.dev/3ZfTI44

Profilw of a 8MB text file: https://share.firefox.dev/4fOcRjc (The gc function names are something i havent seen before. Also interesting that a lot of the marking is not spread on parallel threads)

Comment 7

[Mayank Bansal]

With latest Nightly:
Profile of testcase: https://share.firefox.dev/3CDJUbf
Profile of 8mb file: https://share.firefox.dev/3CIEDzq