1907381 - Expanding the video preview on Netflix is a bit janky and appears to spend time in JS

Status: NEW

(Core :: JavaScript Engine, defect, P3)

Description

[Mayank Bansal]

Go to Netflix and login
Hover your mouse on any video preview.
The preview will expand to become a larger preview with some details
Click on the downward arrow to expand this preview
The preview will become much larger and other details will load

AR: This last step is a bit janky
ER: Not so?

https://share.firefox.dev/462FeXc, https://share.firefox.dev/4eRWum9, https://share.firefox.dev/3XXpWRq

This is not the biggest problem to solve. The jank may also be how scripts on real-world pages work. So feel free to resolve as WORKSFORME or INVALID.

Comment 1

[Mayank Bansal]

Attachment: bandicam 2024-07-11 21-49-54-636.mp4

Comment 2

[Mayank Bansal]

Attachment: about:support

Comment 3

[Nicolas B. Pierron [:nbp]]

Looking at the various profiles, I was not able to identify a single functions which could be attributed for the janks reported in the profiler reports.
On the last jank, there is the GC, but the jank terminates sooner as it is divided in multiple incremental GC slices.