Updating speed of wireless network
Someone nearby may be using your router without your permission and this might explain why your connection has been slow.
By utilizing dual or even triple bands, you can keep older devices that support only the slower G specification on the 2.4GHz band and newer N or AC devices on the beefier and speedier 5GHz band.
The past few years, an even faster protocol, 802.11ac, has become the standard.
AC routers have theoretical speeds of up to 4.5 Gbps and have newer technologies like beamforming and the utilization of eight streams, a significant step up from N routers.
Just choose the one among these that is least crowded and evaluate your improvements.
Switching channels sometimes requires some trial and error. Secure your router As I tell people over and over again, security is very important, especially with routers.