Gentlemen,
As a fledgling AH pilot, I am still configuring my system to optimise its performance for Aces High. I had been running with a resolution of 1024x768 and getting a frame rate of around 50fps. My video card is a relatively advanced one – nvidia GeForce 2 Ultra 64MB – so I thought I would up the resolution in AH to 1280x1024. Of course the graphics became much clearer. In particular, the instruments are much clearer, and I can actually read the ammo counters without having to zoom in.
On the minus side, frame rate went down to 35fps. I checked the Aces High HELP app. with a view to improving this. The only thing I could see that I had not already done was to upgrade from DX 8 to DX 8.1. I did this, and wow! Frame rate has shot up to 68fps.

Video card memory usage has gone up from about 15MB to 24MB, so that means I’ve still got 40MB to spare.
If anyone else needs a frame rate boost, consider getting DX 8.1 if you haven’t already.
Note – I have two HDDs in my system, with W98SE on one and W2000 Pro on the other. I use the W98SE system for running games like AH. I have not yet succumbed to XP (have been warned off – lol)