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I've recently changed isp; and noticed that I no longer can watch video sites like youtube in real time; I need to wait for buffering first. In both ISPs, my speed was same 5 megabits per second.

I've checked normal download of files, and torrents, and they all work fine. Also, checked other video sites, same problem. Used other pc, same problem

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For what it's worth, I've worked for four different ISPs in the past decade, and none of them throttled any particular type of data. You're probably just dealing with latency or an oversold DSLAM.

Are you sure you're getting your throughput? Did you run any tracerts?

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I think bbaja42 wants to know how to figure out if throttling is happening. It certainly has been known to happen, for example a few years ago with Comcast. Also, we can't assume the questioner is in the US. –  Paul Mar 5 '10 at 0:00
    
Paul makes an excellent point--a quick glance at bbaja42's profile shows that this asker does not live in the US. –  Emory Bell Mar 5 '10 at 0:04
    
yep, i live in croatia; europe –  bbaja42 Mar 5 '10 at 9:54
    
tracert of youtube pastebin.com/M68zKgpB i don't see what's the point of this tracert; but I hope it helps in solving problem –  bbaja42 Mar 5 '10 at 10:09
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I suppose the only recourse is to call your ISP and very gently ask for 3rd tier support. Once you get someone in engineering on the phone, ask if they're throttling video. (They will probably say that they're not and suggest that you reconfigure your gateway device. Or the issue could be badly configured cache servers.) –  goblinbox Mar 5 '10 at 20:52

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