I'm starting to suspect that it's a setting or something. I have Captain Sim C-130, Aeroworx B200, Eaglesoft CII and they all run fine, no frame rate issues. I went ahead and bought the Legacy (it was on sale, why not...). Both the Legacy & the ERJ-145 have terrible frame rates in VC. Even while cold & dark with no power applied, just panning around has low frame rates - all my other aircraft are fine.