Browser / Version: Firefox Mobile 82.0
Operating System: Android
Tested Another Browser: Yes Chrome
Problem type: Something else
Description: site is sluggish when scrolling and even kills browser
Steps to Reproduce:
Not a problem in Chrome
Browser Configuration
_From webcompat.com with 鉂わ笍_
Thanks for the report, I was able to reproduce the issue. The scrolling is really sluggish on Firefox.
Note: The issue is not reproducible on Chrome.
I've started to record a performance profile, but it keeps closing the browser, while I'm scrolling the page.
I've managed to save a few seconds of recording.
profile.zip
Tested with:
Browser / Version: Firefox Nightly 200921 (馃 82.0a1-20200918094500)
Operating System: Samsung Galaxy S8 (Android 9) - 1440 x 2960 pixels, 18.5:9 ratio (~570 ppi density)
Moving to Needsdiagnosis for further investigation.
Thanks Oana. How did you record the profile on Android?
In addition to the description:
Operating System: Android 10 on Fairphone 3
@scheinercc very hard, cause my browser kept closing while I was scrolling the page.
But if you wanna give it a try, you can do so from about:debugging (USB devices are enabled, USB debugging on you mobile device is enabled), connect to the device under test from the list and while on the page, click "Inspect".
.
At this point "Inspect" (dev-tools) will be displayed and you can select "Performance" tab and start recording the performance profile.

I hope it helps.
Probably a duplicate of #58697