Hey, thanks for the replies.

MPnetbox, that's fine. As I said earlier, I'll experiment with bigger cells.

SolarB, this engine is truly fantastic. I'll take a deeper look into the code as soon as I have some time. However at first glance it doesn't seem easy to implement, let alone the performance. Just thinking about nested loops and sizes of my maps makes me shiver. But I'll definitely at least try to work it out.

casleziro, true. My buildings are static, but my game is going to have small, moving units. Knights and cavalry, stuff like that. Hundreds of them, pixel-precise movements.