ATV 4 really needs optimizing with the software. Local streamed movies plays nice and smooth with ATV 2 and ATV 3. ATV 4 randomly becomes jerky during any point of the movie, then clears itself up. Even after the media has already completely loaded on ATV 4. Even lowly SD formats play jerky from Home Sharing Library. No problems so far with the old ATV 2 and ATV 3 with my testing. ATV 4 also randomly resets the screen saver to Aerial. Despite Restore and reboots, it still occasionally reboots to Aerial.