I found it here:Interesting. Where did you read that? link?
https://github.com/MartineauUK/wireguard
| * NOTE: WireGuard® is incompatible with Hardware Acceleration * |
| * which is REQUIRED IF your WAN ISP speed is > 350 Mbps * |
| * * |
| * IF your WAN ISP speed is > 350 Mbps then you can * |
| * DISABLE Hardware Acceleration using command * |
| * * |
| * E:Option ==> fc disable * |
| * * |
| * but you will LIMIT ALL WAN throughput (not just * |
| * WireGuard® clients) to about 350 Mbps * |
| * * |
| * NOTE: WireGuard® Manager© will try and auto * |
| * ENABLE/DISABLE Hardware Aceleration based on * |
| * the number of ACTIVE "client" Peers * |