Well I've been playing with it a bit and have had similar results. The shadows mentioned above to tend to lower the fps a bit. But I'm happy with everythign cranked and HDR off. As for AA and iso I just dont see the point for them at such high resolutions. And I agree whenever it comes to a...
I havn't played around with the settings very much but so far what I've found is HDR wrecks my frame rates down to 10-15. Just turning off HDR and my fps goes up to 35-45. I'm running at 1920x1200 btw with all other settings maxed. No AA or iso. I find I dont really need them at 1920x1200...