Model detail medium vs high gave me about 5% extra FPS in the Black Death track. And because I don't mind the difference in graphical quality, it's a good tradeoff for me. The difference should be most noticeable when dog fighting with lots of planes. And in these situation it's nice to have the game as smooth as possible.
According to the CloD manual, model detail has a strong influence on performance. I personally think that clouds and shadows have the biggest impact. In your case, these are (mostly) off already.
Today I've tried the beta patch (ver 1.00.14413). I think it could possibly improve performance for most people. So now and then the frame rate is fractionally lower than before but on the other hand higher above big cities. Most important is that it runs MUCH smoother. The look and feel of the game have improved a great deal (more than the frame rate would suggest).
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