Drop in speed by 80% when connecting VPN

Hello, how to solve the problem with a drop in speed? I put the config open vpn of my own server, connect the speed of at least 40 megabytes on the laptop, turn on the config in the router and the speed drops to 5 megabytes via the cord, and even lower on wifi
Model GL-X750
Help solve this problem!

OpenVpn is slow on the router.

In order to get higher speed, you need to try Wireguard protocol, which could reach 40Mbps.

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