Have you tried CFS2 on your machine? It ran well on my P4, obviously
more powerful than your PIII, but it wasn't that more advanced than
CFS1. I'd be surprised if it ran that much differently than the older
program. As for IL2 FB, I ran the demo for the original IL2 about 3
years ago and found performance abysmal on my machine. It became
acceptable yet marginally so when I added a GeForce III card (and not a
Ti-200), so you may need a significant upgrade to play FB.