Fix low network upload speed in Windows 11 in Parallels Desktop

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This article will help you when you experience an immensely low network connection within a Windows 11 virtual machine.

Resolution

1. Start Windows 11 virtual machine > Open Device Manager.

2. Expand Network adapters, right-click Parallels VirtIO Ethernet Adapter, click Properties > Advanced.


 

3. Set the value of the Offload.Tx.LSO to Disabled. Click OK.

Note: it may be required to do this on every Parallels Desktop upgrade until the fix lands on one of the Parallels Desktop releases.

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