I just returned to the game after a long hiatus.
I have the AMD Opteron 165, moderately overclocked. The other advice in the Aces High support FAQ did not fix my spinning clipboard completely. (MS patch, regedit Throttle Key, updated AMD CPU driver, check for switch in boot.ini) These fixes resolved the issue on the first run, but after relogging, the clipboard spun.
However, the AMD Optimizer did fix the problem completely, I played 3 hours with no lag, stutters, or any problem whatsoever.
Frame rates are insane at 1280x1024, i think my CPU upgrade blows away the single-core Athlon 64 I had installed in the same system.
I underclocked the GPU (AGP 6800XT) speed from 300 to 280 mHz to fix lockups happening in game. Lowest framerates i see are in the high 70s. My gunnery % is up about 10% from my old scores. Life is good, and its great to be back in AH!
-Melkor