Any other argument leads to processing power. 1. Time warp. - You can easily add one more x1M or x10 physics warp if your computer could handle this. 2. Precision in calculation - floating point calculations, big number libraries, double floating points. There are number of possible solutions if your computer would handle this. From my experience - it's physics that holds the game not the graphics. From the other hand graphics can be easily lowered, physics is fixed. Note that the game is not aiming for supercomputer. It must work on average PC.