Large Send Offload or “LSO” is a Property for your Network Adapter. It is supposed to reduce CPU usage and increase network performance. It doesn’t really help at all.  Disabling it can substantially increase file transfer rates on your local network.

You can get to Large Send Offload by going to Device Manager which is in your computers control panel. (Administrator Privileges are required)

• Press Start and in the search box type “Device Manager“.  Select it from the list that populates.
• Expand the list for Network Adapters and double click on your GBE Family Controller.  You can also right click and select Properties.
• Select Advanced Tab.
• Select Large Send Offload v2 (IPv4) and change the value to Disabled.
• Select Large Send Offload v2 (IPv6) and change the value to Disabled.
• Select OK.

You should restart your computer to see the change in speed.

 

If you do not see any difference in transfer rates, you should reset your network connection.

• Open Command Prompt by pressing start and typing CMD.exe Right click on the option that populates and select Run As Administrator.
• Type netsh winsock reset and press Enter.
• Type netsh int ip reset and press Enter.
• Type ipconfig /release and press Enter.
• Type ipconfig /renew and press Enter.
• Type ipconfig /flushdns and press Enter.

Once you have completed these steps you should notice a huge difference in file transfer rates over your local area network connection.  On my computer a file transfer rate increased from about 50 MB/s to 111 MB/s while transferring a file form my NAS to my desktop.