hmmm
a statement made by a friend of mine that was teaching networking in a Utah University:
running red hat 8
serving an average of 18 gigabytes of data a day, peaking at 30 gigabytes
average cpu usage was 5%
peak was 7%
this was for a study he was conducting on data transfer usage with the 3d graphics community.
he had 20 sites hosted.
the peaks came when a client uploaded a new free download item.
he was planning on writing it up, but I don't know if it was ever done. I'll ask him.