Mac Migration

Hi,

I'm doing a Migration from a 2011 iMac to a 2015 iMac.

Its showing about 7 hours.......underneath in light grey it says, "it would be quicker with Ethernet or Thunderbolt cable"......does this mean that its transering over WiFi?

As I have a etehenet cable connected!

Should I take it out and plug it back in? (the ethernet cabel that is!)