What does not work with jitsi? I've been using a lot recently and it is by far the easiest one to use. One link and done. I have lots of video and audio issues with zoom. Now, if you're a company, bluejeans may be the best one.
So jitsi might work for one-on-ones but slightly bigger conference calls are a no-go.
I'm not sure I consider not crashing the OS when the conference starts 'good performance' so much as 'working'. Running it in Firefox at the time was bad performance (sluggish), haven't tested since.
I'm not a company, I'm at a university, and the u. has decided to use Zoom, perhaps because it doesn't care about security, or because it thinks being concerned about Zoom is being paranoid.