Do you use benchmarks for test your computer? which? I guess that anyone that uses a computer for games will probably want to benchmark it, whenever you tweak it or change its hardware.
The most known I guess is 3dmark, but really, 3dmark is just a piece of bloatware, the demo is a 500mb download and you can't change any settings (the default settings are too much for my pc), and it only supports directx, hence just windows.
but I found two pretty looking benchmarks that supports both OSes, one is
lightsmark and
unigine's demos
Unigine's sanctuary and tropics demos are really nice, pretty intensive though, I can only get 4 fps with them

with Lightsmark I get 32-33 fps average
If i feel like booting to windows I'll try them again and see what I get.