Got my p3 pro over the weekend, took it to a lake a shot some beautiful footage in 4k. Got it home put the card in my computer, copied the video to it. When you try to watch it, it is extremely laggy/choppy. I've built computers my whole life, this one has 16 gigs of ram, quad core 4ghz processor...can't remember what video card I have but it was 250 bucks. I recorded on the card that came with the p3, and the card I used on my phantom 2, same result. Tried converting it to 1080p and it was fine but I shouldn't have to do that. I played them in QuickTime and VLC with same result. Anyone else going insane over this? Are there any specific settings I can change in the app to help?