1455187 - Slow scrolling on airtable.com

Status: RESOLVED INCOMPLETE

(Core :: JavaScript Engine, defect, P5)

Description

[Jeff Muizelaar [:jrmuizel]]

Most of the time is spent in script:
https://perfht.ml/2EZ89NE

Comment 1

[Jason Orendorff [:jorendorff]]

A lot of different stacks, too. Lots of events firing, I guess?

20% of the time is spent under PresShell::Paint, so my guess is this web page is re-layout-ing itself each frame, as you scroll.

10% is spent under `get Element.scrollLeft`, triggering layout from script. :-P

First impressions:
- we might not be able to save this web site from itself
- but, it's got source maps, so if we do want to do any work here, it'll be nice

Jeff, I couldn't reproduce this by looking at the landing page, https://airtable.com/ . Is that the right URL?

Comment 2

[Jeff Muizelaar [:jrmuizel]]

Ah sorry here's the URL: https://airtable.com/shrRydo6UXhebLShj/tblc2X4kICL8NGzG5

Comment 3

[Jason Orendorff [:jorendorff]]

Hmm. I can't reproduce using that URL either (in Nightly). ->P5.