What causes my IMac (OS X 10.8.3) to have trouble playing VIdeo?

I am unable to play any internet video without many stops which may or may not resume. I have used ONYX to clean the drive but it made little if any difference. It is not my wifi connection since I have no trouble with video on my IPad or my TV. Any suggestions as to causes for thiis? It has been doing this for some time but i has become in tolerable. now.

Mike thank you very much even though I did not change the channel at least I don't think I did. I did thou got to airport extreme. I knew nothing about it and had not looked at it since I installed it years ago. First I found I had to upgrade airport extreme which I did. But when I finished and everything came back on, I didn't have a green light; so a little more reading indicated I had to upgrade the airport utility which I did. I got the green light that my wifi was working and have been playing a video for the last 25 minutes. Mike this has been driving this octageneran crazy for a couple of months so I really am indebted to you,
oldgranddad (john)

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Hi there, I've had my iMac for about two years, it was a gift given to us. In the last four months it's begun to have issues playing videos. After 30 minutes the videos start to lag and chop and the sound will not play either; the sound becomes very grainy and then it just starts to lag a lot.
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Model Identifier:          iMac7,1
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Total Number Of Cores:          2
L2 Cache:          4 MB
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< Email Edited By Host >

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What causes my IMac (OS X 10.8.3) to have trouble playing VIdeo?

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