

The only objects on the map that have a noticeable impact on performance are plants and animals, a 350x350 jungle map is definitely going to have a heavy performance cost, but is still playable if you make concessions like having a lower population colony or not keeping many animals yourself. A 350x350 flat desert map without water and with all the stone mined up doesn't perform noticeably worse than a smaller map because the pathfinding is directional and only becomes impactful when it needs to make long twisting paths around complex layouts. The larger map sizes are absolutely fine if you balance out the performance demands and control your map.
