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.
The KB5089573 update is part of the company's non-security preview schedule, designed to introduce new features and fixes at the end of each month, allowing IT admins and users to test them before rolling them out to the general user base during next month's Patch Tuesday.
However, unlike regular Patch Tuesday cumulative updates, monthly preview updates are optional and do not include security updates.
With the May 2026 optional update, Microsoft is gradually rolling out general OS performance upgrades and several reliability improvements to Windows Hello.
"This update accelerates app launch and core shell experiences such as Start menu, Search, and Action Center," Microsoft said in a Tuesday support document.
