How to screen capture on Linux / Performance problem

[CodingGhost]

Hi,
I was using HyperHDR on windows previously and it worked perfectly fine, so I know my hardware setup / wled stuff is good.
Now Im trying to setup everything on Fedora 43 KDE Wayland, but it just wont work good. I am clicking the share screen button and select my screen in the firefox popup. This does work, but performance is terrible (5fps). And also it seems firefox has to stay open.. This surely is not the only/best way to do this? I read about Pipewire Portal, but I couldnt find any explanation on how to enable this? I cannot find any options related to screen grabbing at all actually, kinda feel dumb but I really searched for this info and just couldnt find it.
So, whats the recommended way of setting up screen capture on Linux?

thanks a lot!
Jonas