@Winston Churchill - felt compelled to reply to your rather bullish assertion that it's a local network problem - nothing less than I'd expect from the great man by the way! I've done several tests swapping the ATV3 for my old ATV2 and in every one the ATV2 has been MUCH faster at downloading movies - that's with the units in the same location, with the same (wired) ethernet connect, and at the same quality settings (720p HD). It's just iTunes content that's the problem, everything else - Netflix, YouTube, etc - is fine. If you've got any ideas/suggestions - preferably not involving replacing the rest of my network - I'd be really keen to hear them. Just to pre-empt a few of the things you might be considering:
* I've tried restarting, reseting and restoring my ATV3 several times.
* I've run "Test my network connection" on the ATV3, which tells me... wait for it... "Network test successful"!
* I've checked my ISP isn't throttling my connection (and if they were lying, I'd expect the ATV2 to be nobbled too).
* I've tried wired and wireless connections.
* I've tried turning off other IT equipment that might be interfering with network traffic.
* I've tried changing my router and DNS settings.
* I've tried upgrading my router firmware.
* Finally, I've tried cussing, swearing and seething, which hasn't improved the ATV3's performance, but did make me feel better for a while.