Simulation speedup?

I'm currently running a simulation based off of SuperWalker and, due to the nature of its genetics, several hours are required to generate new quality walkers. It seems like the evolution could happen much faster if there were a way to turn off the rendering (this is based on my observation that better graphics cards make the sim run faster). Is there either a way to force something faster than "full speed" or to turn off the rendering to make it faster or some other method?

Thanks!