So I want to make an instance at the mouse position whenever the player presses the mouse. So I have the object and the only code running is : if(mouse_check_button_pressed(mb_left)) instance_create_layer(mouse_x, mouse_y, "Building_Layer1", obj_house); However, the problem comes when I only make around 7 of the objects and the game starts jittering. I'm not that familiar with the debugger, but it says its still running at like 700 fps. So, to my knowledge, it shouldn't look like it's lagging. Also, when I just place a ton of those same objects in the room and then run the game, it doesn't lag at all. Let me know if you need any more information, Thanks!