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I have a problem with my laptop with Windows 7 installed, and I'm not sure how to go around finding the cause of this. Everything works fine on another laptop with Windows 7.

I've noticed that websites started loading slow. So I did

ping google.com 

It took at least half a minute (maybe a minute) to resolve the IP and start to ping. The ping itself was very fast. When I pinged google's IP:

ping 209.85.148.100

It was blazing fast. When I did

nslookup google.com

The response was instantaneous.

I tried disabling other adapters, tried connecting straight to the cable, without the router in between, tried providing DNS server IP addresses manually, tried ipconfig /flushdns, ipconfig /release, ipconfig /renew, tried disabling IPv6. Did Spybot Search&Destroy, CCleaner, Registry Mechanic, Avast scans and cleanups.

Nothing works. Any ideas?

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up vote 1 down vote accepted

Actually, disabling IPv6 with a fix provided here: http://support.microsoft.com/?id=929852 helped. I just forgot to restart the computer after applying the fix and didn't notice any difference. I tried enabling IPv6 back with a fix from the same URL, just to make sure that it was really IPv6 which was causing the lag. Anyone care to provide more information on why?

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