That sounds like a DNS timeout period. I do not offer to troubleshoot your internet settings but if this was my machine I would be useing DNSLOOKUP (again, no tutorial is being offered) to test my DNS entries.
XP Home, SP3, kaspersky Internet Security 2009
I have a weird problem back in September I had XP home installed with all the latest windows and software updated. Then I realize that something was cutting my internet in half I would always do a speed test with cable speakeasy.net and it would always show my down over 17000kbps Up 2049kbps I have comcast Cable. but now my speed EVER go over 4000kbps my upload is always good 2000kbps but my down is horrible, whenever I search a site I always get a 6 second pause then it gos straight to it and my PC also took a little drop in speed as well and i've use every problem that I know is fine to use " spybot, adware personal, Kaspersky, microtrend online, Malwarebytes Anti-Malware, CounterSpy, norton online, ccleaner, windows defender, I forgot the rest but nothing worked. So I decided to go back to Vista home install all my usual programs I had installed on XP fully updated vista with windows tried the internet no problem found. I decided to stay with vista for 3 months to see if anything will happen still no problem so I made a complete backup of vista on my external HDD format HDD reinstalled XP Home December 19, 2008 because I find xp is faster for me install my usual programs fully update windows and here we go again I believe the problem is in one of Microsoft update or optional update but there's so many I don't know which one.