Everyone is talking about swapping the fork, that's great, but the biggest perfomance gain and most bang for the buck is the wheels. If your trying to save money, note I said if, then just replace the wheels. If money is no object then replace the fork, but static weight of a fork is not the same as rotational weight of the wheels. Then replace the crank with lighter crank after the fork is replaced. Personally I would just do the wheelset and call it a day. You can either keep your current wheels for backup or sell them.

By the way the Kinlin wheels are a fantastic wheelset and you will notice a immediate improvement in the ride.