SOLUTION I had the stock 5400rpm drive installed while trying to play Red Alert 3. I kept getting a 5 second lag every few seconds, even on medium/low settings. After installing a new 7200RPM drive there is NO more lag, even on HIGH settings, and the computer actually runs cooler, believe it or not. (more details in post #20) PROBLEM I bought the game last night for my 2 month old Unibody MBP. It installed just fine and started up fine as well. But for some reason when I am playing, the game lags every 15-20 seconds for about 5 seconds. Even with the graphics turned down to low and shadowing/shading turned off. I have my energy settings on 'higher performance' so I know that the 9600GT graphics card is enabled. I'm pretty convinced that my issue is not the lack of a capable graphics, or my lack of ram (4GB). I'm beginning to think that my 5400rpm hard drive is the culprit. I'd love to splurge for an SSD drive, but I'm not about to drop $300+ on a hard drive. Would installing a 7200rpm drive solve my issue? Or is there something else I'm overlooking? For those who don't know what 'Command & Conquer - Red Alert 3' is: http://en.wikipedia.org/wiki/Red_Alert_3 Minimum Requirements: AMD Athlon 3000+/Intel P4 2.2GHz or equivalent, 1GB of RAM, 6GB free on HD, nVidia GeForce 6 series/ATI X1800 or better, DX9c or 10 compatible sound. Recommended Requirements: AMD Athlon X2 (3500+)/Intel Core 2 Duo (2.6GHz) or equivalent, 2GB of RAM, 10GB free on HD, nVidia GeForce 6800 or better/ATI X1900 or better. As you can see, The game isn't extremely demanding. And I exceed all of the minimum requirements as well as the "recommended requirements". Thanks for the help.