My experience with rendering in Pro e / creo has been poor.
One tip, when you are rendering , pull up your systems performance monitoring app and keep an eye on memory usage, it creeps up the longer the clip until it crashes around 95%.
Switch to 64 bit, add more memory, try to keep the clips short is what I found works best in Pro e/ Creo.
I find the rendering capacities in Pro e / creo is lacking behind industry standards.
We should have the option to send it to a rendering machine on a network to number crunch it.
I am currently using Daz3d to do mine. far more options, far better animation control, send to network capacities to render.
I export the componets from Pro e/ Creo as wavefront (obj) , import into hexagon, reassambly the model and than re export as wavefront (obj ) (pro e/Creo wavefront obj isn't right for daz3d for some reason ) .
I then import into Daz3d, far better animation control then in creo, support for external rendeing engines (luxrender, reality 2 ) so the job can be sent to a dedicated rendering PC or render farm to churn out.
I am in the middle of doing one now, I am planning to post a how too do it on here when I am done.