I have mostly kept my MBP unibody to the energy saving mode with NVIDIA 9400M because I like the longer battery life and I don't do any gaming... However, recently while playing around, I decided to try the 9600M GT mode. What a surprise. Everything is a lot faster!! Applications load faster, everything is just snappy!! I know that Snow Leopard uses the graphics card if needed for general processing (?Grand Central Stuff?), but I didn't expect such an improvement on general performance that is not gaming... I was thinking about getting an SSD, but I don't think I need it! Has anyone else noticed this? Does the Processor also run at a slower speed when in the energy saving mode?