Slow Firefox after upgrade

[joanandk]

Hi,

I have found a peculiar bug: After updating my system to Kernel 5.10.27 and Firefox to 78, I have very poor web experience. Graphic intensive (online games) applications are unbearably slow.
The odd part: the bug seems to be only on systems with Intel graphics adapter. Systems with other make are not affected. Tested on two systems with Intel and three systems with Nvidia or AMD.
The second odd part: On the two systems with Intel which I have, if I go into suspend to RAM and wake the system up, the issue is gone!

So at the moment, my workaround: Start up the system, put it into suspend to RAM, wake it up and do whatever I wanted to do.

Has anyone else have seen such effect?

BR