Plasma 6 flickering

Hi. Sometimes, when i browsing sites (Firefox), flickering occurs. Sometimes other programs flickering too. This happened after the update to plasma 6. KDE Neon Testing Edition. nvidia-drivers latest (545). Any ways to fix it?

You will probably need to check bugs.kde.org to see if there is a bug report for the problem you are experiencing already. If there’s not, you should probably open a new bug report and make sure to include more details (software & hardware), otherwise the report won’t be much help to the developers.
Maybe you can also capture the bug on a small video with spectacle. This should also be of some use to the developers (at the very least in order to verify your bug).

Also please keep in mind that the more effort you put into a bug report the more chances there are for it to be taken seriously and acted upon.

I hope this helps.