Disclaimer: Following thsi guide may break your computer, your mother's heart, or both. Proceed at you own risk:
You can look elsewhere for a description of what all these settings do. I'm just sharing what config I'm using. With config, my frame rates seem to be just about as high as they were previously, and my CPU temps stay around 88 or so. You can potentially use this as a base to get started and then customize from there.