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Slow speeds on wireguard install on ubuntu 20.04 with PiVPN

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I installed wireguard with PiVPN on Ubuntu server 20.04. The server has enough RAM and good CPU. Using UDP with port 2028

The server is behind NAT (mikrotik router).

My server configuration is :

[Interface]
Privatekey= key
Address = 10.179.90.1/24
MTU = 1420
Listenport = 2028

[Peer]
Publickey = key
PresharedKey = key
AllowedIPs = 10.179.90.2/32

I tested the Internet speed of the Ubuntu server : >200Mbps

For testing the speed, I use my phone hotspot : without vpn : 100 Mbps | with vpn 12mbps Tested with different networks - same slow speed.

I tried to check the speed with iperf

[ 4] 8.00-9.01 sec 896 KBytes 7.27 Mbits/sec
[ 4] 9.01-10.01 sec 1.25 MBytes 10.5 Mbits/sec

I have the same configuration, but with raspberry Pi and the connection is excellent. May Be it is some Ubuntu problem ?

I tried some MTU changes on server/client - no luck with it.

Any ideas ?

Best Regards

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