I have 3 Netgear Nighthawk routers set up as my network. The main router is connected to a cable modem. The other two routers are configured to be access points. They receive their connection to the network via ethernet (on the WAN port). Each router's wireless settings are configured to be on a different channel to cut down on interference issues. Each router has the same SSID.
I've noticed that my speed generally suffers with this setup. However, if I change each router name to a different SSID, it seems almost twice as fast when I connect to one of the routers when they have unique names. I've tried this with multiple devices and across different parts of the house.
What could be causing this?