Hello peeps! 

I have some upcoming work to do with a class room scene and i am wondering the best way to do this without overloading my pc? Is is best to save scenes with some children then repeat the same scene with other children and over lay the two images in my art package? 

how have people approched this before i would be most intrested to hear. 

Overlaying will work as long as the rendered images don't conflict with each other in terms of shadows, figure placements, lighting, etc.  Anything that pertains to the background can be rendered and placed on a flat plane for future images.  Use low-resolution figures and props and consider converting background characters to object props as minor background filler.

I do a lot of images with crowds and up until recently, I was using a computer that was mid-quality back in 2010. The worst had 70 people. Here is a tutorial for how I do crowd scenes https://www.renderosity.com/rr/mod/tutorial/?tutorial_id=3044. It doesn't require using only lo-res figures either. The biggest thing you need is patience.

thanks for the help guys

Erogenesis has done some really nice crowd scenes.

https://www.renderosity.com/forums/threads/2936633/lord-of-the-flies-case-for-firefly

Consider using Firefly instead of Superfly.