when you install network framework 1.1 and 2.. does the pc slowdown?

I mean are there dll's or services that load, or anything else
that can slow down a pc even slightly? Is there anything that runs
along windows when you install these?

Or do these frameworks load ONLY when needed from a program?

I now I am talking about details here, but I am thinking of old systems,
and whether I should install the frameworks on them....

thanks!