Browser Speed

I have a Macbook Pro with an 802.11n wireless card. I have OS X 10.5.6 installed on one partition and WIN VISTA Ultimate on another. I use Safari and FireFox as browsers with the MAC and Explorer and Safari with Vista.
I do a lot of video downloading and recently determined the cause of getting slower streaming speeds on the MAC. Using the same internet connections, and even getting the same download speeds from my ISP, my brower windows are opening 3 to 4 times faster on WIN then on MAC and I cannot explain this. I spoke to Apple tech support and they suggested reinstalling Safari on the Mac (before they would have to charge me for the help!)which I did but it did not make a difference. This slower speed on the MAC also manifests itself when during my video streaming.
Any suggestions....
Thanks, Henry

Please bear with me, my technical proficiency is marginal. I've also noticed that I'm running very slow compared to Tiger. I haven't tried just plugging in the cable yet. I will, but I'm also having another wireless issue. I keep getting the message that it can't find a PPPoE server, and I'm not connecting. What's that about?
When you say you changed settings to WPA/Personal 2 on access device, just what do you mean? is the access device the router? I use WPA and have a password. Is there something else I have to change in my settings?
Any info is greatly appreciated.

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