Note that widening the channel may or may NOT increase 5Ghz wifi throughput.
A couple of reasons that I know of:
- at that "center" channel 62 any widening would overlap the very busy looking 44 next door, i.e. increase in interference..
- many client device's can't use 40 or 80Ghz-width 5Ghz channels anyway.
I have a pfsense CE firewall, free, on an old mini desktop. The web-configurator has a traffic graph status page that lists every connected device's bandwidth in and out, updated every second. An overall LAN/WAN traffic graph too, of course.