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TCP retransmission -> slow speeds

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Since I have a 400Mbit/s connection the VPN speed dropped significantly.

The problems started after upgrading my internet connection to 200Mbit/s:



This could be solved by changing the MTU size.

Now I have 400Mbit/s and the VPN speed is dropping and even changing MTU does not solve the issue.



I started analyzing the issue with wireshark and found tons of "TCP retransmissions".



Any idea that to do?

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