Hi, There is my setup: a 2011 mac mini, 4th gen airport extreme and a WDTV Live. (and few windows laptops) Before I had a MBP, a windows PC, file transfer were allright. For some reason, I cant get decent speed when transferring files on my network if my mac mini is involved when using an ethernet cable. Speeds are fast when using WiFi. I changed the cable and bought a good Cat 6 cable and no results. I cleaned install OSX 10,7 and still, not better. Why would the file transfer when using the Ethernet port would be slow (4h for a 1gig file) and normal or fast when using Wifi. Oh and by the way, my WDTV is wired so is my windows tower. File transfer between them is real good.