^ WHAAAAAA? Apart from the tough races and hard to master handling, I haven't had single bug with NFSHP. Not even the infamous multi-core-crashing bug. Both my systems (Q6600 and i5-750) run the game beautifully without any issues. The graphics are gorgeous, even on my age old Radeon HD3870 and on my HD5770 I can even force AA from Catalyst center, making it look all the more better.
I would say, from my experience that I haven't had any performance issue with the game. Not a single stutter or lag even in the intense crashes. I'm running it at 1680x1050 with 4xAA on my 5770 and 1440x900 with no AA on my 3870. On the same systems NFS Undercover used to lag, so that says a lot about performance.