I just got a brand new hub delivered today (Australia), and are experiencing this issue out the box. I installed the latest update (2.1.9.117) but still have a massive performance issue.
The Web UI is not usable and times out. Pinging the device I can see its dropping a lot of packets.
Open a Log tab and report whats going on.
What are you calling Web UI ?
A dashboard or the Hub configuration webpages ?
Have you tried performing a Reboot from the Settings tab ?