80 - 100FPS with no bricks
40 - 60FPS with ~2500 bricks
25 - 30FPS with ~4000 bricks
12 - 20FPS with ~8000 bricks
7 - 12FPS with ~12500 bricks
3 - 8FPS with ~20000 bricks
anything over 20000 bricks is just bad bad.
if the map is Adjustable Plate, Bedroom, or anything with fog or interiors/terrain, divide the FPS by 2