GL-MT300N-V2 Slow Lan Speed

Hi guys, i have slow speeds in a GL-MT300N-V2.
I have it in Acces Point Mode, the WAN port has a cable from my ISP (160 Mbps), in the LAN1 port has a cable to my Desktop PC.
You can tell I’m using it as a switch.
The problem is that my pc reaches about 70-80 Mbps connected in this way.
While connected directly to the cable of my ISP I reached 160 Mbps.
What I can do?

Probably because the Ethernet ports on the GL-MT300N-V2 aren’t gigabit.