Microsoft released a new update for the Xbox One OS yesterday (version 10.0.17763.4085, rs5_release_xbox_dev_ 1902.190131-1620). According to the official changelog, Xbox One users will get 'improved 4K visual performance in games', improved performance on the Home dashboard and the Guide, as well as an improved video pipeline for apps that should allow Netflix (for instance) to properly display 4K content.
Let us know in the comments section if you do notice any of the above while using your Xbox One.
Release date
2/12/2019
Audio
Added reliability fixes to Cortana.Unplugging a headset during video playback no longer results in audio loss before video playback freezes.Made audio system upgrades when switching from Home to a game or app.Cortana
Improved Cortana responsiveness to commands.Console
Fixed an issue that caused some consoles to crash unexpectedly.Home
Improved performance on the Home Dashboard.Mouse
Improved mouse responsiveness to reduce lag.My games and apps
Improved the installation experience for various FastStart titles.Fixed a problem in some games (e.g. Resident Evil 0) in which cutscenes would fail and the game would lock.Fixes an issue to ensure certain apps like the Avatar Editor and Microsoft Rewards work on first launch.System
Fixed an issue in which some people received the E203 error when taking a system update.Improved performance on the network port.Improved performance and reliability on the save game feature when games are suspended.Improved speed and performance of My games & apps.Improved idle screen performance.Improved 4K visual performance in games.Improved the performance of the guide on Home.Video
Made improvements to the 4K video pipeline so that apps like Netflix display 4K content correctly.