eliasfrost, check to see if your gpus are blacklisted - that is the most likely cause of a massive slow down like that. My umbra game demo runs with >2000 objects per level, physics, shaders, 14 layers, >40 mb images... and so on, all at 60 fps as long as the graphics driver is supported - that goes down to less than half that if the gpu is blacklisted... Things to also check are collision checks per tick (hundreds can be ok, but it depends on your export target), object behaviors that are not required because the objects are off screen should be disabled if possible...