Yeah, it is one reason why I occasionally switch off Naval units on various maps otherwise it gets too busy. There is no way to fix it really as it is a 32bit game and thusly will run poorly after x amount of units are produced. I never touch 80x80 maps as a result and stick to the 20x20's. There are too many AI 'tracking' related bugs that just get worse as the unit count goes up on AI's end.I would be playing SupCom: FA more often, except for the bug which basically slows the game time down as the game progresses on larger maps. I did a bit of digging around, but it seems there isn't a way to fix it, meaning massive battles soon become unplayable :/
I played Ashes of the Singularity sometime last year. Whilst good it wasn't a patch on Forged and the units were quite lacking in variety. The AI and Visuals were excellent as was the engine performance but it just felt disjointed to play.