Guess what, I had the same frames issue as u guys, jumping between 40 and 6 fps, I tried the easiest thing and unchecked the high quality 3d cockpit in the Fsx graphics options menu. Now the phenom keeps a stable 30fps and finally I was able to do my first regional flight in IVAO...of course the readability of the gauges is reduced but I don't care so much since I'm using the Saitek FIPs ....cheers
niko