Why is this bike faster and more efficient than all my other bikes? Mine is singlespeed and the chainline is straight as hell. Is that the secret? Or is it the slick tires? Or the relatively light weight (17lbs)?

Granted, my other bikes aren't $1000 road bikes, but I feel that the efficiency of my little bike is due to the perfect chainline. In any case I wanted to see what you guys thought. Detailed specs here:
http://www.pacific-cycles.com/bikeca...cat=3&rnum=888