TBH I have only just set it up, so I need to experiment more. The UI it is really fast for me since it is running on a Raspberry Pi on my local network. All my events are also being shared to other relays so when I use @damus on my phone, it shares to the Damus relay, my private relay (over Tailscale) and others. I see no reason that performance should be any faster/slower than any other relay setup overall.