Tower of RigidBodies very slow

[LukasBanana]

When I try to rebuild the tower-example (where lots of rigid bodies are stacked) the performance goes down dramatically.
But I can't find where the different between the example and my code is. I also enabled freeze- and auto-sleep mode.
What is the key function to achieve fast performance when stacking lots of rigid bodies?

[Julio Jerez]

you are using the solver mode 0, whic is teh default, use mode 1