FL Studio 7 supports performance improvements for dual-core, multi-core, and multithreaded processors. Turn on multi-threaded generator processing via the menu OPTIONS-> General settings, and click the button indicated in the diagram above.
What does this do? Here is what the help file has to say about this feature:
"Multithreaded generator processing – If you have a multi-core or multithreading processor this option will distribute the CPU load of compatible generators across the cores improving performance. "