@Maktos,

I was going though the interface, and it seems as though you are correct, there is no page for monitoring the device usage statistics. I can definitely see how useful this feature is, especially on one of our gaming routers. 

I recommend creating a post on the forums in the feedback section so that we can properly keep track of and provide communications about feature requests such as this in the future.

Out of curiosity, what routers have you had that offer this information on the management interface? I don't recall seeing this setting on many of the routers I've previously had.

Something of interest to note, I run Home Assistant for my smart home on my Home Network, and my installation has survived three different routers, each time my Home Assistant has been able to automatically discover my router and add the current connectivity, upload, download, CPU, and RAM usage. As a result, it may be possible to get the statistics using a third-party application.