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VPN slowing down WAN traffic ONLY over wifi?

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wacko911

New Around Here
AC68u 380.64.

So I noticed something strange tonight.

I connect via a VPN client on AC68u which is connected to 38Mbps fiber via openreach modem.

If I connect via Ethernet I get 36mbps via the VPN as expected. If I connect via Wifi (2.4 or 5ghz) I only get 20mbps. I get over 300mbps over wifi from a NAS share so it isn't the Wifi connection speed. I've tried disabling HW accel with little to no effect. The CPU usage is about 60% on core 2 with the VPN over wifi and 90% on core 2 using ethernet.

Any ideas what might be causing the VPN to only slow down WAN traffic when using Wifi?

VPN off - Ethernet and Wifi wan speed = 38mbps
 
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