I am using my M4 in AP mode (router mode speed is worse, story for another time). I connected my laptop to the main M4 ethernet (router >>> M4 >>> laptop) and I am only getting 500-530mbps out of my 1gbps plan. When I directly connect to my modem/router, my laptop is getting 900-930mbps.

I have CAT6 cables both on my router and the M4. I also tried placing a network switch in between the router and laptop (router >>> switch >>> laptop) and I am also getting around 900mbps speeds.

I tried setting my other M4 units as main and performed the same test and the speed is still roughly around 500mbps on all of them.