The increase in performance should probably be similar to the desktop version of the Rage 128 compared to the GeForce 2 MX, seeing how the GeForce2GO and MX are both lightweight versions of the GeForce2. Even with this fact the jump should be incredibly high.
I would look for benchmarks of the GeForce2GO on the PC side, though I'd expect a little better performance from our superior OS and hardware
I was unable to find any on it, maybe you'll have better luck.