I can confirm that the Intel chipsets are problematic with AF5.7 ( heck with any simulator for that matter ).

AF5.7 likes graphics adapters with MORE than 256megs of VRAM.

I tried running AF5.7 on an iCore7 machine using a 256meg Nvidia 9600 card and the results were poor ( 1-3 FPS ).

When I merely swapped out the card for an Nvidia 560Ti with 1gb Vram the simulator became silky smooth with everything cranked up to maximum and the 3D airports ROCK!