Windows 11 KB5089573 is an optional non-security preview update, but it still deserves attention from IT teams.
The update focuses on performance and reliability improvements, including faster app launch, smoother Start menu, Search and Action Center experiences, Windows Hello improvements, File Explorer reliability fixes, and better behavior during Modern Standby.

Since this is a preview update and does not include security fixes, organizations should avoid broad production rollout without testing. It is better used to validate upcoming changes before they are included in the next Patch Tuesday cycle.

 For businesses, the message is simple: even non-security updates can impact user experience, login behavior, compatibility, and device reliability. Test first, deploy carefully, and keep Windows update management disciplined.

Microsoft has released the KB5089573 preview cumulative update for Windows 11 versions 25H2 and 24H2, which comes with 30 changes, including performance and reliability improvements. [...]

Source: Windows 11 KB5089573 update released with performance improvements via Bleeping Computer — published 27 May 2026.