Please consider this idea in a future patch.
Simply an option to adjust at which level the 3d models turn to icons. The game is very playable on my 1ghz Athlon, 512 Ram Geforce 3 when I am zoomed out to the icon level. But just 1 zoom level closer and the game crawls to 3 - 6 fps, and heres the thing, the ships at that zoom level are too small to see anyway.
So why not be able to change the zoom level at which ships turn to icons? This would greatly enhance performance and you could still zoom in closer if you want to see the details. This would make the game immensely more playable at medium zoom levels. Also since stars and planets seem to have less polygons you could adjust them to shift to icons at farther zoom levels.
This is a great idea for running the game on older computers which actually increases the Gal Civ 2 user base. Please consider. Thanks