Out of curiosity, what kind of request/second are you seeing and what was your before/after VPS cores? Is it built with rails?
I don’t measure req/sec here, but at one point, I had 2.8k visitors in an hour. Before rescaling, it was running on Hetzner’s CPX11—2 vCPU cores shared with a few other Rails apps. (I didn’t expect it to go viral at all)