I love Arch compared to Ubuntu, but I haven't noticed a speed difference. What kinds of things do you see a difference in?
I have an arch server. I just tested and can do "sudo reboot", it becomes unpingable after 2 seconds. The turnaround from shutdown to sshing back into it is just over 20 seconds. (I'll bet it would be faster if I didn't have the 5-beep no keyboard sound at boot)