Current firmware version: 7.0.1 freezes the (Firefox 55.0.3) webbrowser for minutes when opening the “Status → Client list” page (/cgi-bin/MANGA/index.cgi?mode=config&option=clientlist) for a network with 1000+ clients.
At the moment there are 5139 devices in the list (no typo: over five thousand devices).
Please improve this view. Starting by default to only show the online clients only.
Balance 310 Hw3 is an old hardware. Even the new hardware supports 20-150 users only. Since you have few thousand users, I suggest upgrading your device. Below is the Balance model comparison.