OS version - 10.0.17763.3066 (rs5_release_xbox_dev_1811.181206-1740)

Release date
12/13/2018

Mouse
Improved the responsiveness of mouse performance to reduce lag.

System
Improved system performance.


Source: https://support.xbox.com/en-US/xbox-...erating-system


See also: November 2018 Xbox Update Rolling Out Today - November 14 Xbox - Windows 10 Forums