Wifi settings : DDWRT
https://www.reddit.com/r/DDWRT/comments/eygcxy/wifi_settingsWhat is the best setting depends on your circumstances and equipment. Generally, for a 5Ghz network with good signal penetration you want to set the channel width as wide as possible and make sure you're on a channel with no competition (use a wifi analyser app to check this both at the site of the router and at the sites of clients that will connect to it).