Is there a way to pause simulation?

[josemendez]

Thanks for help. But if I change inverse masses and velocities to zero during simulation does it affect performance in some way? So I still have performance drop during "pause" because technically it will still simulate this item? Or no?

Technically, yes the object will still be simulated, unless you can disable the solver too (in case this is the only actor in the solver). The action of setting the masses and velocities does not affect performance, it is simply a loop doing some assignments.