1809011 - On a codepen demo (https://codepen.io/ScarpMetal/pen/ZExbJvo) "resetting" the demo is slower in Nightly compared to Chrome

Status: NEW

(Core :: JavaScript Engine, task, P3)

Description

[Mayank Bansal]

Go to https://codepen.io/ScarpMetal/pen/ZExbJvo
Let it load. Enjoy the demo.
Click on the demo pane to make it active
Press the "R" key on your keyboard.
The demo will "reset"/"refresh". This takes appreciable time on Nightly. On Chrome, this is almost instantaneous.

Profile: https://share.firefox.dev/3ZgkcR8

Comment 1

[Jan de Mooij [:jandem]]

We spend almost all of our time in JIT code, filtering an array.

This will be easier to investigate when we have JIT code information available in the profiler.

Comment 2

[Jan de Mooij [:jandem]]

Hm I noticed we don't call SetIsInlinableLargeFunction for ArrayFilter. We probably should. Let me see if that makes a difference here.

Comment 3

[Jan de Mooij [:jandem]]

I filed bug 1809180. It's hard to say if it makes a difference here but it's probably a good idea anyway.

Comment 4

[Mayank Bansal]

Attachment: somewhat reduced standalone testcase.html

Just press "R" key to get the demo to run

Comment 5

[Mayank Bansal]

https://share.firefox.dev/3AwG4Q9