Windows 7 Professional decreasing network speed following connection

Upon initializing a connection to any resource both on internal and external networks, the transfer rate will continually drop from 30MB/sec until it hovers around 2MB/sec or lower over a period of 20 seconds, regardless of the amount of data being transferrred.

The computer in question is part of a Gigabit network, and the slowness is independent of network services; file transfers over network shares on the Windows domain, Lotus Notes replication, everything is affected.
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JohnBusiness Consultant (Owner)Commented:
Since all is basically working in this case, try upgrading the NIC driver to a new version. At a minimum, replace (uninstall / install) the NIC driver.

Try a different computer on the same network wire at the same time (put in a small switch) and do side by side comparisons.

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Do a continuous ping (-t)  from the machine in question to one of the sources and see if there is anything happening there .Another computer using the same ethernet connection? Same results. This computer on another connection, same results.

Other suggestion already given re drivers for NICa good place to start as well. I think we need to narrow it down somewhat.
JohnBusiness Consultant (Owner)Commented:
@Titlevest  - Thanks and I was happy to help.
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Windows Networking

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