SMP Seesaw is a 102KB freeware utility for dual-CPU or dual-core processors that controls how Windows balances the compute load between the two dual core processors.
By default, Windows tries to evenly balance the processing load between both CPUs among all programs. SMP Seesaw allows you to change the bahaviour and dedicate a single processor for a particular game/program thereby improving the performance or responsiveness of that program. However, not all programs would be benefited. Programs that are designed for multi threaded operations would still require the default behaviour.

Download Link- http://www.mlin.net/files/SMPSeesaw.msi