GitHub UI Unresponsive

Just now, I noticed the GitHub page to review PRs becomes totally unresponsive if the PR is moderately large.

Typing text on the box to comment on a diff line takes 10 seconds to even show the characters being typed inside the textarea. I've tested on an M1 and M4 Macbook Pros.

I noticed the GitHub UI is getting slower and slower over time, but now it is just impossible to do any work.