On my UPC Giga Connect connection, the UDM achieves exactly 930 Mbit/s (CNLAB speed test) with all available IPS rules activated. If I deactivate IPS, it is also 930 Mbps in the download, only the fan no longer revs up. The 850 Mbps that Ubiquiti specifies is an understatement. The UDM is one of the best all-in-one devices and highly recommended for tech-savvy home users.