General network issues with Windows and VMXNET3

Some time ago I blogged about a strange CPU/Thread problem which affected various NAV versions (2013-2016) in virtual environments;


This especially affected VMWare machines, specifically running the vmxnet3 network-adapter.
I recently got some info, that this is also a general issue of Windows with this adapter!
Changing some settings of the network-adapter seem to help, stabilizing the system and boosting performance!

Details here:
Windows Server 2012:
Windows Server 2016:


Author: Jörg Stryk

I’m working with MS Dynamics NAV (formerly Navision) since 1997, with SQL Server since 2003. I have a 100% focus on “Performance Optimization & Troubleshooting” (and things in touch with this).
Since 2006 I’m supporting Dynamics customers and partners within their NAV projects as a freelancer; so far I have supported more than 500 projects in 25 countries on 5 continents – and counting!
I’m developing & distributing the optimization utility the “SSI Performance Toolbox” and I am the author of “The NAV/SQL Performance Field Guide” (ISBN 978-3-8370-1442-6).
Microsoft “Most Valuable Professional” (MVP) 2007-2017.

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