1426926 - Performance on heavy ReactJS site is a lot slower than Chromium

Status: UNCONFIRMED

(Core :: General, defect)

Description

[Andrei Petcu]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0
Build ID: 20171222220251

Steps to reproduce:

Open both Chromium and Firefox on this page

https://build-nqxqpolwwl.now.sh/

Here is the video

https://vimeo.com/248563892

I recorded 2 profiles here https://perf-html.io/public/65800c7060a03b1a84f68ef3210044993ba10cd3/calltree/?hiddenThreads=&thread=2&threadOrder=0-2-3-4-1&v=2 and here https://perf-html.io/public/5dc7dfe54172588df16293165e4fc090f7c90a38/calltree/?hiddenThreads=&thread=2&threadOrder=0-2-3-4-5-1&v=2


Actual results:

Firefox is a lot slower than Chromium.


Expected results:

Firefox should be close to Chromium on performance.

Comment 1

[Andrei Petcu]

Same results on v57 stable

Comment 2

[Daniel Holbert [:dholbert]]

For what it's worth: on my Linux machine, Firefox Nightly is a bit faster than Chrome here.

I started them side-by-side (in equal size windows), and the burst-counts incremented at about the same rate, though by the time I got up to ~200, Firefox was 10-15 bursts ahead.

(Also: for anyone running this, be sure to test with equal sized windows. Window-size makes a huge difference in timing here.)

Comment 3

[Daniel Holbert [:dholbert]]

andreip, can you still reproduce slower-in-Firefox results here? (in equal-sized windows)

Comment 4

[Daniel Holbert [:dholbert]]

For what it's worth, we got mixed results when triaging - smaug got the same results as me (Firefox slightly faster), while jesup saw chrome being a bit faster.

Comment 5

[Cam]

Ugh, I wish I could share the react app I worked on a while back. It is really easy to demo Chrome obliterating Firefox with it.

I'll ask and see if I can share.

Comment 6

[Daniel Holbert [:dholbert]]

Thanks -- if you can share it, please file it as a new bug, since it may exercise different stuff from the benchmark that this bug was filed about.

(and if/when you file, bonus points if you put "[qf]" in Bugzilla's "whiteboard" textfield -- that'll make it more likely to get on the radar of performance folks)