Ethernet port. At regular intervals of about 10 minutes (this is programmable but this is the stock value) Windows will issue a DHCP request and wait for an answer. Sometimes this is noticed as a delay.
Fix? In the device manager, disable the unused device.
It happens typing OUTLOOK messages or messages on online forums. I'll be typing and suddenly everything freezes; but I keep on typing and about 5-8 seconds later the characters suddenly catch up.
Seems this began after a recent Windows XP update, but I don't know. I've experienced it on my laptop as well, but since some of the same software is installed, could be that. I have VCom's Fix-It 6, but don't know whether that could be the problem or not. Oooops...did it just now.
I hate it.
Thanks for any assistance!