issues with synchronous and asynchronous modes

[angian00]

Hi. I would like to use (a modified version of) manual_control together with generate_traffic, in 0.9.16 version.
The problem is:

• if all is async, the generated vehicles proceed by leaps, running and then braking continuously
• if all is sync, all the movements (autopiloted cars, my car, the animations of the people walking too), are sped up by some factor, as if my cpu went too fast or something. This happens even when no traffic is active beside the manually controlled vehicle.
  Am I doing something wrong? Some fps cap to set maybe?