I have been having a similar problem with slow browsing. I have been monitoring this forum for the last several weeks trying to find an answer. I found that we used a Single Level Domain Name to Identify our root domain, Microsoft does not recommend the use if single level domain names in Active Directory, however they did publish an article on what to do to make it work.
What I did find is if you set up Active Directory with a single level domain name (like the way Windows NT used to have their domains) the Windows XP boxes don't play well. The Microsoft Knowledge Base Article 300684 explains what you need to do in the regestry to make things work.
Most of the posts I reviewed seemed to have the same problem as I did (the single level domain name). By following the recomendations in the Knowledge Base Article we did speed up our network browsing from 28 seconds to open a network share to about 9 seconds of lag time.
Hope this helps .
Larry Keith
Coastal Telco Services
----- Pratish Dayalji wrote: -----
Microsoft say slow browser networking is by design. They knew all along people would face this problem. Read the following MS KB article,
Re: WinxpSP1 Pro: Very slow network browsing. 
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