Thanks for the quick answer.
Well, like I said, I'm developing on WinXP, ActiveState. Box, it's modern but nothing special. 512MB Ram, 1 CPU, Ghz I don't know, whatever was standard for new desktops in 2004.
I have a vanilla 512MB dsl connection with deutsche telekom, as far as I know.
Why would disk IO matter, and how do I find out disk IO? Ditto for the capacity of the network.
If I accomplish what I want to accomplish, when this leaves the development phase I may be running the code on a linux box with more juice. Basically I just want to keep things flexible for the future.