SolverIterationCount impact on windows and mac

Hi,

I am experiencing some difference between mac and windows when setting up SolverIterationCount for the physics simulation. to avoid springy and wobbly joints I have to set it very high, and on mac it runs fine and I happily go up to 100 wihout problems, but on windows It really really slow down the physics simulation ( not the frame rate) and can't really go more than 40.

Is it something that is known? or is it me not doing something correctly?

thanks for your insight.

Bye,

Jean