FPS doesn’t impact the physics simulation. If the game gets below 20, you will start feeling the delay. 60 FPS is great, 30 is good and even 20 is OK. The higher the FPS rating, the smoother the game runs. It is defined by FPS (frames per second) as well. Performance means how smooth the game runs. Simple worlds run smoothly even on low-end computers, but a more complex world with rich object interactions could overload even high-end computers. We need you to understand that performance depends on the complexity of your world and the configuration of your computer. At certain points you will probably reach the memory limit of your system and won’t be able to add more objects, but that’s the only limit we imposed. Space Engineers tries to not limit how complex worlds you can create.
