This worked for me no warranties implied or expressed. If it doesn't work for you, or smoke starts pouring out of your machine that's your business not mine.
Here's what I saw before...
Specs 512M ram, AMD 1.8, Geforce 4 MX 440, and Soundblaster Audigy Sound Card. Running XP, with the Nvidia reference drivers that are certified from their site, as well as the latest Audigy drivers from the Soundblaster site.
I run in 1200 resolution 32 bit color.
AH ver 1.08 min 30 FPS about over a huge furball at a smoking field. 75 FPS (limited by monitor refresh rate) most of the time in average flying conditions.
AH ver 1.09 min 15 FPS max mid-40's FPS.
My solution...
I went to
http://www.guru3d.com, I went into their drivers section and downloaded the 27.70 ver of the windows XP Detonator drivers, downloaded the Via 4.10b AGP driver for my motherboard, I manually turned off anti-aliasing by going into the control panel for the video card, and turned the sound acceleration down to half.
I made the first mistake in trouble shooting, by changing all of these things at once. Forgive me I was getting tired of the slide show every time I was flying near any field on fire.
The Result...
45 FPS per second in the absolute worst possible flying conditions. 30 + planes everything on fire (Rooks got all cranky that we vulched their field so they came over and egged our house) 75 FPS every other time I looked at the counter.
I didn't do any more testing than that. I was just happy to have fluid frame rates again. Hopefully, this may help some of you.