Wireless transfer speeds between macs in a home network
If working to transfer between two Apple machines, you should know that other connections can be used: you can simply use a Ethernet LAN cable, and plug directly into the network port on both machines (using dongle if necessary). You do not need to use a 'patch' cable, as the network ports will self-configure properly. You can also use USB-C, Firewire or Thunderbolt as network connections. All of these options are far faster than using pretty much any WiFi. 

For using other cables, its best to use Apple's Migration Assistant. You can also use Target Disk Mode, which allows you to simply mount the other Mac hard drive on your new Mac.