This is an fps test in London, after adjustinc graphic configuration. FPS measured in fraps were variable from 20 to 25, with some stutters sometimes when loading buildings. Perfectly flyable in the most hard scenario. Totally fine in other scenarios, with fps up to 40.
Pc used:
I7 920 overclocked to 3,33Ghz
6 GB RAM DDR3
Nvidia GTX275
Windows 7 Ultimate 64 bits
Relevant settings in Nvidia Panel:
AA set to 2x
Anisotropic filter deactivated
Graphic setting in the simulator:
Buildings, trees, scenario, effects: low
Planes, damage: high
Shadows and runways: activated
Grass: deactivated
Realism settings: full real except for external views