You could try making sure no apps are running with some kind of task manager and make sure under settings and battery you have it set to hi performance,
Part of the slowdown has to do with the GPU, if you watch the videos where they bench the nexus 2.2 inc and X you'll see that because of the dedicated gpu on the X it scores much higher, but if you what the footage on the x you'll notice 2 things, 1 it freezes at a point, and this wasn't just that one test i've repeated and have the same freeze happen on my x as well as a droid (in the same spot) which makes sense both GPUs for the droid and x are the same.
As well you can notice that it doesn't properly render the shadow of the tree, my guess is the gpu can't figure out how to use the graphical data. (so if it's not even displaying the imagine at full quality or detail i'd imagine it have a bit of a leg up on speed)
So those are things to keep in mind, i shut down all my apps and in smart mode for the battery. NFS runs pretty well. maybe try a reboot