Rendering Lion/Snow Leopard

I have the 3.4 GHz iMac, with a Lion partition and a Snow Leopard partition.
Running the Blender Bench test render gives me 51.68 seconds for the SL, 22.64 for the Lion. This is not a processor issue, are there any Blender settings that can be changed to hurry SL up a bit?(I spend more time there for some of my older software).
Thanks guys.