OK so no cause for concern in this instance but I would still like to know how is the bandwidth dealt out and how USB 2.0 and USB 3.0 work together....
Does the hub switch to USB 2.0 on its uplink port and therefore share the 35 - 45 MB/sec between all USB 2.0 devices plugged into it or does its uplink stay at USB 3.0 and share the 625MB / sec between all USB devices plugged into it?
With all the devices being backwards compatable and you connect a usb 2.0 to the hub you will get the correct bandwidth that the device needs and the hub will be connected by 3.0 and the devices by 2.0. As PasMark has said a mouse and keyboard will use next to nothing for bandwidth and unless your connecting an external hard drive enclosure with a SSD inside you won't have to worry about bandwidth , the hub is designed to give each device it's rated bandwidth.
I fully expect a 3.0 hub to give the appropriate bandwidth to all the 3.0 devices that I connect to it.