From what I know the graphics were rather hard on the GBA in the first place, and there was similar slowdown in the airship and battle parts. I'm using VBA 1.6a because ever since 1.7 came out, games slowed dramatically. Try using older versions as they seem to play FFV fine. Also, i'm on a laptop with 1.2GHZ PIII 512MB RAM and Radeon 16MB. From what it seems, you should have the advantage, but integrated video could always be the problem. Emulator wise, make sure you have performance eaters such as vsync and graphics filters turned off. And try the different graphics modes (GDI, DirectDraw, Direct3D, and OpenGL) to see which one is fastest for you. I also get these performance drops when the fan turns on. VBA is very power hungry and will heat up your system fast. As always, close any unneeded tasks in the background and make sure your are virus and spyware free!