Orbi uses "Dynamic QoS" which is supposed to use the speed test results (download and upload speeds) to manage bandwidth. Dynamic QoS is common in many of the new routers.
In the Help section on the web GUI on the QoS page you can read the following:
Dynamic QoS Help
Dynamic QoS improves online gaming and online streaming quality by prioritizing Internet bandwidth usage. When the router detects online gaming and online streaming traffic, the router tries to limit background traffic such as BitTorrent or FTP downloads to improve gaming and streaming.
Internet Bandwidth - Let Speedtest detect my Internet bandwidth (recommended): Accurate Internet bandwidth is required for Dynamic QoS to work properly. The router automatically runs Speedtest the first time you enable Dynamic QoS. Click the Speedtest button to recheck your bandwidth. Avoid any Internet activity while Speedtest is running.
