@jomo I use it (riot) daily in desktop (Ubuntu and Fedora) and mobile devices.
Performance is great in both apps. Fast and responsive.
The only "problem" I have with it is with the complicated encryption and trust system. It really doesn't help, but I hope they improve it in the future.
Also, the UX of Riot could be much better.
@jomo I use it to talk with some people in matrix and also in telegram and irc (the power of bridges).
@jomo first class bait :^)
@jomo matrix.org is slow af, I don't have my own homeserver yet. Performance *can* be great though