Macbook 3,1 slowing down
I have a late 2007 Macbook 3,1. I updated my RAM to 4GB and installed an internal 500 GB hard drive. I'm running 10.6.8 Snow Leapord. The Macbook has recently began freezing a lot. I used Onyx to clean up the system, deleted junk from my startup, and deleted unneeded docs/apps but it did not help much. Do I need to update to Lion? Any other suggestions?
MacBook, Mac OS X (10.6.8)