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Do a continuous ping (-t) &nbsp;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. <br />
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Other suggestion already given re drivers for NICa good place to start as well. I think we need to narrow it down somewhat.
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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.

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@Titlevest &nbsp;- Thanks and I was happy to help.
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@Titlevest  - Thanks and I was happy to help.

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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.<br />
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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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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.

Windows 7 Professional decreasing network speed following connection

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.

Windows Networking

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).

Network Analysis

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.