slow down the solver

[wixar172]

It depends on what you mean by "slow down" the solver. You can slow down time, slow down convergence speed, decrease stiffness... all have different effects.

To slow down time, reduce the timescale and set the solver to use interpolation, just as you mention you did.
To slow down convergence speed, set the SOR factor of your constraints to a very small value.
To decrease constraint stiffness.... well, decrease constraint stiffness .

thank you, i will try this
Best Regards