With Windows
Vista you have noticed the slow internet speed. The web browsing and
downloading speed is very slow as compare to previous versions of
windows. You can open the same sites in windows XP and server 2003 with
the normal speed.
Follow the given steps to increase the Vista browsing speed:
First go to Advance tab in Internet Explorer and turn off the TLS (Transport Layer Security) encryption option.
Here to fix problem with some secure pages turn on the SSL 2.0 (Secure Sockets Layer) feature and click Ok button to close it. 
Courtesy : katiharho.blogspot.in
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