08-02-2012, 02:35 AM
You use GM right? I think there was an option to disable all objects that are out of view (it's been a while so I'm not entirely sure). If that's not enabled, you could try if that helps. Other than that, all you can do is to try to optimize your code. Code optimisation is a whole book on its own, though. Using less objects (enemies etc) in areas where the framerate drops should also help.