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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