Well, my serwer is not ideal, but I'm running eZ on php-fcgi + all possible caching (excluding static cache) + eAccelerator. The hardware is shared hosting, but according to them, the machines are Dell servers with Intel architecture (8 processors each), 16 GB RAM. They don't show any additional info.
My site is quite fast, but not that fast as some sites can be. Additionally, don't know why, but always after typing www.mysite.com it takes over 5 seconds for the site to react, and then it goes quite fast.
Moreover, I get errors when trying to set up template compress.