Mine was a shock compared to my old Windows Home Server I built on an HP Server.
The replacement NAS is nowhere near as fast, in fact with a large number of small files, it's pretty poor. Can't remember the figures off the top of my head, but it's not great.
However, the upside is the electric bill
I really didn't realise how much the WHS was costing to run 24X7 ......... the NAS is very, very economical in comparison.