Nope, every device connected is using very low traffic. Its quite strange because it looks like it's capped at 20Mbits, it doesn't vary much, maybe 18/21Mbits, not more, and if I, for example, download something with a device, connected over Wifi, using all the 20Mbits, all the other devices struggle going online because thats the whole bandwidth available for all the devices connected to the Wifi network.
Maybe you can connect to my R2 and check if something is wrong?