For me the patch increased FPS and banned the stuttering (almost).
Everything max, ssao off, AAx2 @ 1920x1080
Everything runs smooth, except:
Flying over london gives me about 20 fps.
Flying low over london (rooftop) it gives me about 10 fps and some stuttering when flying over new (unloaded) terrain.
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Core2Duo E8400 @ 3,6Ghz
Asus P5QLD Pro Mainboard
8GB Kingston RAM (DDR2 800)
MSI R6970 Graphics Card w/ 2GB
Win7 Pro x64, SP1