Aside from consuming a ton of resources when screen sharing, my experience with Jitsi meet has been very good. It consumes two cores of my 5900X (1 for the Firefox process, and another for some system process I don’t recall exactly) but it works. This was with sharing a 4K screen.

I have run jitsi on cheap VMs and it worked decently. But you need quite some cores to serve all the traffic. Ultimately I ended up having as many 2-4core VMs as I had concurrent calls.