TP-Link Internet Booster and Distributor

Hello, I have a TP-Link brand signal booster and distributor, very excellent, it transfers the original modem speeds if connected via Ethernet cable. If connected wirelessly, it depends on the distance between it and the modem. For example, if the distance between the modem and the distributor is approximately ten meters, it will transfer the same speed. However, if the distance exceeds 15 meters, it transfers half the speed. Negotiable