1851371 - Nightly is 8x slower than Chrome on an online Brotli compressor

Status: NEW

(Core :: JavaScript Engine, task, P3)

Description

[Mayank Bansal]

Save the attached sample text file to your local machine.
Go to http://dominikhlbg.github.io/brotlijs/
In the encode box, click on the dropdown and select "11"
Browse to the locally saved text file and click OK

Nightly: https://share.firefox.dev/3qO1hko (32 seconds)
Chrome: https://share.firefox.dev/3qWGOcX (4 seconds)

Comment 1

[Mayank Bansal]

Attachment: Sample text file (d3.js ).txt

Comment 2

[Mayank Bansal]

https://share.firefox.dev/3L9LFhM and a profile of compressing a 1MB image.

Comment 3

[Jan de Mooij [:jandem]]

The flame graph shows quite a lot of time under GetSparseElementHelper.

Comment 4

[Mayank Bansal]

FWIW, we are faster at decompressing using the same utility.

Nightly: https://share.firefox.dev/46TFp7s (1.9s)
Chrome: https://share.firefox.dev/3Az1tsd (2.6s)

Comment 5

[Mayank Bansal]

Latest profile: https://share.firefox.dev/3PwBKEM (27s). So slightly better than before.
Also interesting to see some regalloc time in the beginning. 50ms or so, so no nothing major.