New Post: Memory versus Disk space usage

I'm trying to get 200 page TIFs of quite high quality converted into single page PNGs of a lower quality.

The problem I'm having is that my C# app is using shed loads of disk space but hardly any memory. When I have it working on 2 files at once it takes up 12gb of disk space and only 50,000k of memory.

How do I set it to use more memory and less diskspace?

Thanks for any advice you can give me.