There are some programs you may use.
Primarily intended for emulation purposes I belive.
Mo'Slo; there is an older Version that's trialware, can be found here:
Other games just run as fast as they possibly can. One solution there is to run a program that wastes your computer's processing at a steady rate, or other tricks and there are PD programs specifically for this task. For example, one program for this is called MOSLO, but there are others.