Total Commander

Have you considered threading total commander - specifically the processes that add-ons use. I frequently will unzip or un-rar or use any of a number of add-ons on several files at once and I have noticed that quite often, my I7 processor has core number one pegged but the rest are at zero. How difficult would it be to program a thread handler?

If your file manager works with files, it spends most of time on disk IO operations and not on CPU operations.

I'm already threading many operations: in all those where there is a "background" button. Also some file system plugins already support threading (they need to signal it via function FsGetBackgroundFlags).