The operators/owners are shown behind the address. Performance will differ and is based on at least those factors : 1) performance of the server itself 2) speed of internet access, also depending on your location. My https://at.nostrworks.com has 6 vCPUs and 16GB RAM and can handle many more client...

I might try and figure out a monitoring dashboard on a development relay so you can see the performance of my relay. At the minute it is 4cpu and 24gb ram and 100gb disk. Hosted in London