esSJae's Virtualization Blog

Virtualization and other IT topics

Slow Windows VPC Networking speed/access to hard drive

Posted by essjae on August 8, 2010

This is a little old, but it still pops up from time to time.

If you’re having network speed issues, VPC Genius Bob Comer has the fix:

The problem is TCP Offloading and Windows VPC not getting along, here’s how to work around the problem by turning off offloading:
The fix is to edit the registry, use at your own risk and only if you are comfortable with editing the registry!

To turn off TCP Offloading, add a DWORD value in


label it  DisableTaskOffload , and change the value to 1, then reboot.

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