Megabits. For some reason the LAN transfers are being done through the internet, even though everything is connected via Cat5e, a gigabit router and SSDs.
For example, this is a screenshot of the transfer speed to my SSD from a 3.0 USB stick connected to my 3.0 port on my router.
https://gyazo.com/ab75b3436991112c0ef42a945856e97d
Same transfer speed over wifi and cable between 2 PCs as well.
To make it even more confusing, I can't access the other PCs on my LAN unless my router is connected to the internet.