Problems with the mesh optimizer

spielereinz_8872e9675e

I'm running a series of rather heavily scripted renders (lots of loading and applying of pose presets) and sometimes it seems like the scene does not have time to stabilize before the renderer is called.
This results in poke-through on various pieces of clothing, that are not there if all the presets are applied manually.

So,

Is there a way for me to detect when the collision detection / mesh optimization is running, so I can delay my render until it is done?

Any help/hints greatly appreciated.