If you are looking for the fastest WordPress Theme, I would recommend two which I used frequently.
On this site and also on my friends’ sites:
Both are very light and very fast. Which ever you use, just make sure you don’t slow it down with unnecessary plugins.
A Jedi must always have a sense of control. This is the path of the light side. If you follow it properly, then your WordPress installation will definitely be lightning speed.
Other than a fast WordPress theme, you should also a fast server.
juan.my is on MariHost.