I don’t have an OpenVPN Server, right now. But I do testing against my WireGuard Server in LAN.

Setup: Internet - Fritz!Box 7590 - LAN - Proxmox Host (with Wireguard Container) - Switch - LAN - Switch - LAN - [Testing Device] - Laptop (Lenovo X200s)
no WLAN tests, here.

Device VPN Download Mbit/s Upload Mbit/s Ping ms Temp ′C
X200s off 158.8 46.6 3 40.1
Beryl off 102.2 46.0 3 35.2
Beryl WG 78.8 46.5 5 34.1
Slate AX off 140.8 46.4 3 47.2
Slate AX WG 98.4 45.9 4 49.0

Source: Google speedtest
Please note, that the singe core X200s is a reliable work laptop, but not high performance!

The Beryl passes 65% of the maximum bandwidth and 50% over Wireguard. The Slate AX passes 89% and 62% with Wireguard. I would say a nice improvement!
But for a price. It has a higher power consumption and produces a lot more heat.

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