It is for the HTC One X, but I can confirm it works well for the infinity. Try the automatic method method(provided you have the game installed already.)Password is hamdir.
I tried the automatic method and then the manual method(pushed it to 1.5ghz in the nfsmw_scaling file),ran the automatic method again and removed the scaling file...Ran it..And voila!!Reflections on vehicles that wasn't present before with just Automatic method. Performance is the same! Love it! Again I have to stress that your mileage may vary. Until Asus pushes that tegra update I am going to go with this!!
P.S: I got this from one post in a thread which was lying around in the apps section which I am pretty sure wouldn't have reached the general thread. So spreading the good word. I know people dying to run the game on the tablet! I am one of them!! One more thing. I am on stock. If you want more ram,developer options-->Limit background process to 4 or less.