If 3 PC's are playing videos will the performance be the same as 1 PC playing a Video

If I have 3 desktop PC's that are all the same brand/model and lets say all are playing a medium sized video from lets say YouTube or another website.  Is my performance slower overall for the 3 PCs or would the speed be the regardless if I was playing video on 1 PC or 3 PC's.

My speed via Comcast is 10 mbps (up to 10 mbps), thus my assumption is that provided Comcast can deliver 10 mbps then as long as I do not exceed 10 mbps per second then the  1 vs 3 PC scenario is immaterial ?  

What if my speed for 1.5 mbps ?  I assume then it is an issue because then I have a huge data stream coming into a 1.5 mbps broadband pipe ?  For best performance on video playing how much mbps does a medium sized video need (per second)...
pbo1Asked:
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Ian MeredithConnect With a Mentor Commented:

If watching youtube, your speed will be about the same for all 3 PCs (Youtube is not a streaming video service, it downloads to your PC)
If you were watching streaming video, 3 will be slower than 1.

Generally the limitation of video speed/supply is reliant on the webserver you are connecting to.

I would say 1.5mbps for reliable performance playing medium sized videos (say per PC).

Here are a couple of interesting links....

http://www.amitbhawani.com/blog/youtube-streaming-videos-bandwidth-usage/

http://forums.techarena.in/technology-internet/1174568.htm
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Craig BeckConnect With a Mentor Commented:
The 10Mbps Comcast are providing is the theoretical maximum amount of throughput on your line.  You will not necessarily achieve 10Mbps.
If you want to watch the same video on 3 PCs you are actually downloading the same file 3 times.  The transmission is Unicast.
This will mean that your throughput is accumulative, and therefore you will use more bandwidth than if you only download the video to 1 PC.
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pbo1Author Commented:
What is the recommended bandwidth then for a household where at any given time my sons or daughters could be playing 3 average sized videos on there PC's ?  Should I get the 15mbps package from Comcast
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