Real-Time Physics Simulation Forum

What's bullet's fastest recommended simulation time in order to keep it real time? Is it possible to make the cpu clock faster so that you can get speed up the computation time for each physics step?

Do you mean "What the minimum frame per sec that can make its user feel that the program is really responsive"?
If so, it is a very subjective question, but I love 60 fps and Bullet can usually achieve it.

Or do you mean "How much cpu-time per stepSimulation that is required by Bullet?"
If so, it really depends on how many objects/constraints in the scene, degree of overlap, complexity of shape, .... .
Trying to use minimum numbers of them is one of the art of game design.

Or do you mean "How to make my CPU faster?"
Overclock, or buy new hard-disk, more ram, or new computer.

Hope that help.