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I’ve recently changed my ISP and noticed that I no longer can watch video sites like YouTube in real time; I need to wait for buffering first. On 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? – goblinbox Mar 4 '10 at 22:49
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 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

The easiest way would be to try calling their customer service and ask them. Most hard-wired internet providers in the first world don't care how much data or what type it is, within reason of course. If they do though, they are generally up-front about informing customers.

The next best way to test this is to check other video streaming sites, such as Vimeo, Revision3, and even Facebook to get a baseline. Perhaps even upload a test video of your own if you want to be scientific. After that, you should use a VPN to access those sites. Make sure the VPN encrypts your traffic. This will make all the data that goes over the wire look like gibberish, and it would all look the same, with no noticeable difference between streaming videos, or anything else. When on the VPN, how does your streaming look? Granted, a VPN adds an extra few hops for your data to go through, but if the ISP is filtering based on the IP or the content of the Data, you will be able to notice significantly better streaming!

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