I am having issues with my home office setup and I would like some advice on solving this issue. I have a USB Drobo hooked up through a drobo share. I have 3 desktop computers that are aging. They are all P4 dells. All my devices have 10/100/1000. My router/switch is also 10/100/1000. But my main problem is the information on my drobo is a lot slower than what I would like. I don't know if all NAS's are pretty slow, the drobo is slower because it is usb hooked to a droboshare, or if the desktops are just too outdated.

So the options I have thought of are either...
Replace the desktops possibly even with laptops
Replace my Drobo with a known faster NAS
Add a server like Windows Home Server

Please all advice is welcome