Why is my Air Very Slow?

I have a MacBook Air, late 2010, running Mountain Lion (it was shipped with Snow Leopard and I've upgraded to Lion, then Mountain Lion. I've been disappointed by the performance on Internet, very slow to load pages, sometimes not at all, and video clips on Youtube invariably stop every few seconds for a reload that often takes 15-20 seconds. No difference between Firefox and Safari. I don't see much adverse comment on Internet re Air's performance, so what's going on? Two questions:
1. If all wireless bars are on, can I assume the signal is OK?
2. Is Air just plain underpowered? Is the new Air better?
Thanks, Irwin

walkeri wrote:
What was that all about by the way? What is DNS anyway? Is that like IP address or something? Should that be a part of instructions before installing Mountain Lion, about which there seem to be many complaints about slowness?
Irwin
It's kinda hard to explaing without writing a whole page....But sometimes the DNS assigned to you by your ISP is slow so what i did was give you a public dns from OpenDNS if you'd like to know more about DNS and their functions - Click here.

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[email protected]
www.adventnet.com

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[email protected]
www.adventnet.com

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