Ethernet ports are usually just relegated to connecting computers to routers to facilitate an internet connection, but they're capable of much more than that.
Transferring files from your laptop to a desktop PC is simple – usually. If you are visiting a customer's or vendor's site, the IT staff will usually help you connect to their network and transfer ...
The sysadmin's guide to repurposing an RJ45 port ...
Whenever we work on multiple systems, we prefer sending files over the connection. After all being on the same LAN connection makes our work easier, file transfer is what makes our tasks difficult.
If you want to get your Mac to have high and reliable file transfer speeds, over a network, you're best off switching from Wi-Fi to wired networking. Here's all the information you need about things ...