Sudden poor OpenVPN Performance

[rebelscum]

Greetings,
We've been using OpenVPN for quite some time with our pfSense firewall. It was worked great just recently. Suddenly it is significantly slower than I've ever seen. The only configuration change made was pointing the server side configuration to new internal DNS servers over the weekend. The DNS servers are fully replicated and working. Otherwise, everything remains the same.

Anybody have a clue what might cause such a sudden performance hit? The system resources all look good.

Thanks!

[rebelscum]

Attributed this to Windows Update KB5013887. Once removed, OpenVPN performance is back to normal.