Magic -

" ... I'd now like to focus on rendering time efficiency."

Not to derail into a discussion of rendering programs, but if render time is an issue (50 hours! Yikes!) then give KeyShot a try. It plays well with MoI and it is FAST. A look through their gallery should tell you if it's a fit for the type of work you're doing. It ain't free, but time is money.

Ed Ferguson