What the KB5089573 Windows 11 Performance Update Changes
The KB5089573 Windows 11 performance update is a cumulative release that speeds up core interface elements and app launches while refining reliability, startup behavior, and hardware monitoring for everyday users. At its core, KB5089573 is part of Microsoft’s new K2 performance initiative, which shifts focus from flashy features to “foundational OS performance” after complaints that Windows 11 felt slower than earlier versions. According to Windows Central’s testing, the update delivers concrete gains: system flyouts, such as volume or network pop‑ups, are up to 70% faster, and app launches improve by around 40%. Microsoft’s changelog says the update “accelerates app launch and core shell experiences such as Start menu, Search, and Action Center,” reflecting a coordinated effort rather than isolated tuning. These optimizations aim to make Windows feel quicker in the small interactions users repeat hundreds of times a day.
Inside the K2 Initiative and Low Latency Profile Rollout
KB5089573 is the first major output of the K2 initiative, a multi‑phase effort to improve Windows 11 performance at a system level instead of stacking on new interface layers. A key element is the Low Latency Profile, which prioritizes responsiveness for the shell and frequently used actions. Microsoft is rolling this behavior out gradually on compatible devices, so not all users will see the full speed gains immediately after installing the KB5089573 update. Instead, the profile may activate weeks later via controlled feature rollouts. This staggered approach lets Microsoft monitor stability and tune thresholds, but it also means benchmark results will vary for a while. Under the hood, related preview builds suggest performance boosts may involve short‑term CPU prioritization when launching apps and handling “core shell experiences” like Start and Search, aiming to make the UI feel snappier without permanent resource spikes.
Real‑World Impact: Faster Flyouts, Start Menu, and App Launches
Performance claims matter only if they change daily use, and KB5089573 appears to do that for many systems. Faster system flyouts mean volume, Wi‑Fi, and notification panels pop up almost instantly instead of lagging behind clicks or key presses. Speeding these transient UI elements by around 70% reduces the subtle friction users feel when adjusting settings or checking status. The 40% improvement in faster app launches has obvious benefits for office suites, browsers, and lightweight tools that users open repeatedly throughout the day. Microsoft also notes that Start, Search, and Action Center are now treated as “core shell experiences,” so their improved responsiveness is part of the same Windows 11 performance update rather than isolated tweaks. Combined, these changes translate into a general sense that the desktop responds more promptly, especially on systems that previously felt sluggish under Windows 11.
Fixing Taskbar Freezing and Startup Slowdowns—With Caveats
Alongside responsiveness boosts, Microsoft is still chasing a stubborn problem: taskbar freezing and blank desktops after sign‑in. A separate update, KB5089549, targets how Windows 11 handles applications that launch at startup, an area linked to freezes and long delays when the desktop first appears. Reports indicate that users who do receive this patch notice smoother performance right after logging in, with fewer hangs when right‑clicking the taskbar or desktop. However, KB5089549 also highlights the flip side of these improvements. Some systems encounter installation failures with error code 0x800f0922, leaving affected devices stuck with the older, buggy behavior. There are also complaints about an unexpected new folder created during installation, which has worried some users even though no serious security issues have been reported. Until Microsoft resolves these rollout problems, not everyone will benefit from the intended taskbar freezing fix.
Task Manager Gets NPU Awareness and Other Quality‑of‑Life Tweaks
KB5089573 and closely related preview builds also modernize Task Manager to reflect the growing role of AI hardware. On PCs equipped with an NPU, users can now add optional columns for NPU, NPU Engine, Dedicated Memory, and Shared Memory on the Processes, Users, and Details pages. Neural engines that sit inside a GPU also appear on the Performance tab, giving a more complete view of AI‑related workloads instead of hiding them behind generic GPU graphs. An optional Isolation column shows which processes run inside App Containers, helping users and administrators understand security boundaries. Beyond Task Manager, the update improves USB‑connected display wake reliability, reduces sensor hub power drains in standby, and upgrades Secure Boot certificate targeting. These changes do not grab attention like faster app launches or system flyouts speed gains, but they round out KB5089573 as a practical Windows 11 performance update for everyday use.