You can google a site that hosts movies and check if it plays smoothly. The leaks I've tried (1743, 1767, 1791) had the movie stuttering when played. And I've checked if it's the connection and it's not.
Cheers! :)
Z10 STL 100-2 | back to 10.1.0.1481 (because the flash player in 10.2 is busted)