Yep. After a lengthy period of gameplay, I came to realize that the tweaks were only good for 'loading times' between stages. Stages are loading much quicker. But the games are still running slow, or choppy.
Also, I tried installing NVmax but the installer keeps telling me that I need to install the latest detonar drivers (20 or higher), but I allready have Detonar 40 version 44.03 installed. Anyway...