Consistent for me too. If I reload while in BD, it is fine until something triggers it to stutter, probably like they've said in other posts, the waterfall, torches, etc. It usually stutters every 2 seconds I counted as I'm running. There was a particle issue back in '06 early '07, so not sure if that is still the case? It is a massively cool looking area, so I can see how there'd be issues, but just seeing if there was maybe a fix or if they needed any feedback on this area. This looks to be the newest post on BD? I tried some different settings, turned on SLI, load all maps in the beginning, vertex, aliasing, etc, but still get the 2 sec quick stutter. Still playable for me, though I thought for sure I'd fall off the side a couple times when it stutters and when it recovers, my mouse is accidentally pointing off the ledge. Keeps it interesting on long road trips.
AMD X2 4600+
4 GB RAM
2 x Geforce 7600 GT