Comment 5 for bug 1959747

(In reply to 794632548 from comment #0)
> User Agent: Mozilla/5.0 (Windows NT 6.2; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0
>
> Steps to reproduce:
>
> My Linux Arch/Manjaro TB package was just upgraded:
> 78.14.0-0.1 -> 91.1.0-0.1
> and immediately i have noticed the new feature/issue:
> in the unified Inbox i am moving mouse up/down quickly through the list of e-mails and i can see that the line the mouse is on is highlighted with delay, meaning that this highlight action may be not optimized/badly made or CPU heavy.
> And i think that my XFCE tray CPU usage meter is showing that the CPU usage rise when i move the mouse through the list of e-mails.

arnauld, can you reproduce this?