Similar flight at the same location and same time of day. First half of this video is with FXAA and 8X SuperSampling. Second half of this video is No FXAA, just 8X SuperSampling. In all cases frame rate is locked at 22 fps. Clouds or no Clouds didn't seem to make any different in fps. Textures are set to 2048 x 2048. NVidia Inspector settings: AA Setting = AA_MODE_METHOD_SUPERVCAA_64X_4v12, AA Compatibility = BioShock/BioShock2, AA Transparency Supersampling = 8X SuperSampling, FXAA Usage = Allowed, Negative LOD Bias = Clamp, Anisotropic Filtering = 16X.