1732675 - Browsing GTK's GitLab pages is slow to the point of causing Firefox to hang

Status: NEW

(Core :: JavaScript Engine, defect, P3)

Description

[Gabriele Svelto [:gsvelto] (PTO)]

Basic information

Steps to Reproduce:

1. Browse to https://gitlab.gnome.org/GNOME/gtk/-/tree/master/gtk
2. Scroll down

Expected Results:
I can scroll (fairly) smoothly

Actual Results:
The browser hangs for several seconds before the page gets rendered, the "slow page" button pops up

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More information

I tried this on Linux and didn't give the site a spin on other browser yet. I will and report back in case it's a problem on their side.

Comment 1

[Mayank Bansal]

https://share.firefox.dev/3i8qXAz

Comment 2

[Jon Coppeard (:jonco)]

GC activity makes up less that 6% of the total. The page is doing a lot of allocation and some of the minor GCs are longer than we'd like but this doesn't specifically look like a GC problem.

Comment 3

[Matthew Gaudet (he/him) [:mgaudet]]

Loaded this in Safari; page load is very similar between Firefox and Safari. I'd argue this is a site issue right now, unless there's something clearly better.