Wired internet slower than wireless

Hello, I am getting slower speeds via ethernet than I am on Wifi. All updates and firmware upgrades have been performed. Gb network adapter on my computer.

Internet speed: 1 Gbps download

Modem: [Arris SB8200](https://arris.secure.force.com/consumers/ConsumerProductDetail?p=a0ha000000TnNQCAA3&c=SURFboard%20Cable%20Modems%20and%20Gateways#panel3)

Router: [Archer A7 AC1750](https://www.tp-link.com/us/home-networking/wifi-router/archer-a7/)

Cables: All Cat 5e

My ISP says the connection to my home is flawless.

* On WiFi I get about 200-300Mbps download. Every device tests about the same.

* Ethernet plugged into router gets ~ 200Mbps.

* Ethernet plugged directly into modem gets ~70-150 Mbps.

Any ideas? Thank you