This article gives you an overview of helpful and amazing CLI commands, which are available but not yet integrated within Web Interface. (Commands available from 4.33 - WK30 Code or later) can be find here:
Note: All CLI commands, needs to be enter by "SSH". Some of them need execute into "configure terminal" mode before the command will be accept.
CLI Documentation Full
This command can help you to evaluate the Speed from WAN, without need a test computer in LAN segment.
Web Server Limitation:
ip http max-connection-per-ip <10..200>
This command limit the simultaneous session a Hotspot User can create on a Web-Server (USG Webinterface). It can help for schools / student living rooms, where people may try to open GUI hundred times and try to attack it. The suggestion is to set limit to 20.
Flash is full (100% Flash Usage)
debug system _disk-cleanup
In some rare conditions it could be that the Flash is full (100%). To clean it up, you can run above command.