I clicked on your referenced link and it began quickly and played through to the end. All was normal. This was about seven hours after your post. The video was run on my somewhat old/slow laptop via my internet service which is also a fairly slow DSL... made even slower this week by soggy ground which seems to slow down the service here in rural, western Montana. My GT setting is is 720p.
Given Admin's response and my 'test', it looks like your problem results from your settings or is an ISP issue.
"It takes a lot of devotion and work, or maybe I should say play, because if you love it, that's what it amounts to. I haven't found any shortcuts, and I've been looking for a long time."
-- Chet Atkins