Running on my own hardware at the moment, I'm looking into VPS options though. Its a VM on a dell R720, gave it 8 CPU cores and 16 GB RAM (It's ddr3 though). I'm literally the only person using my instance at the moment, but performance has been great. Some issues federating with lemmy.ml, but I'm pretty sure that's on their end since every other instance works fine. Really the biggest downside has been there's nobody else to subscribe to communities to get the federation started, so every new subscription is pretty much empty for a while.