I’ve run benchmarks on a set of 150 games in MAME. I tried to pick a fair sampling of the classics and the more modern games, I even included a couple of obviously impossible ones. I do seem to have ended up with far too many CPS2 games though!
The benchmarks have been run on the Raspberry Pi Model B, The Raspberry Pi 2 and the Raspberry Pi 3. I ran them Normally and Overclocked.
Check out the results here.