KB5089573: Turning Performance Complaints Into Measurable Gains
KB5089573 is the first visible outcome of Microsoft’s K2 initiative, a program focused on fixing Windows 11 performance at its core rather than simply adding new features. For many users, the operating system has long felt a little sluggish, especially when compared with snappier rivals. Windows Central’s testing reports that with this Windows 11 performance update installed, system flyouts such as Start, Search, Action Center, and context menus can render up to 70 percent faster, while app launches improve by up to 40 percent. Microsoft’s own changelog backs this up, describing the update as one that accelerates app launch and core shell experiences. The speed boost will not arrive for everyone simultaneously, though. Microsoft is gradually enabling the underlying Low Latency Profile components after installation, so some devices may take a few weeks before users fully feel the difference in system flyout speed and app launch speed.
How Low Latency Profile Makes Windows 11 Feel Snappier
Low Latency Profile is the technical engine behind KB5089573’s speed gains. Traditionally, the Windows CPU scheduler scales processor frequency up and down to balance performance with power consumption. That ramp-up takes a moment, and in UI terms it shows up as the familiar micro‑stutter: click Start or double‑click an app, then wait a fraction of a second before anything appears. Low Latency Profile changes this behavior by detecting high‑priority interactive actions and temporarily pushing the CPU to its maximum frequency for roughly one to three seconds. That short burst window is enough to handle tasks like rendering the Start menu or beginning an app launch at full speed, after which normal scaling resumes. Internal testing cited by Windows Central and Windows Latest indicates this burst‑based approach delivers up to 40 percent faster launches for built‑in apps and considerably quicker shell responsiveness, with minimal impact on battery and thermals thanks to the brief duration.
Real-World Impact: Fixing Start Menu Lag and Silent Micro‑Stutters
The changes are aimed squarely at everyday frustrations. Many users know the subtle but persistent pause when opening the Start menu or launching common apps; it is not a crash, and restarting does not help, it is simply how Windows has historically felt. With Low Latency Profile enabled in current Release Preview builds, testers report that the Start menu appears essentially instantly instead of after about a second, and system flyouts feel more responsive overall. On budget or older hardware, Task Manager reveals a short spike in CPU usage right as the user opens Start or begins launching an app, matching the design of the profile. While some power users will notice the improved app launch speed immediately, others may experience it as a general sense that Windows 11 is finally keeping up with their clicks instead of trailing half a beat behind.
June Rollout, Broader K2 Features, and What Comes Next
Low Latency Profile is currently live in Windows 11 Release Preview build 26200.8514 and is expected to roll out broadly as part of Microsoft’s June 2026 Patch Tuesday package. It arrives alongside the KB5089573 update, which not only accelerates app launches and shell elements but also delivers roughly 30 reliability and quality‑of‑life tweaks. These include Bluetooth LE Audio broadcast support for sharing audio with two listeners, more reliable display wake behavior on USB4 docks, and improvements to USB3 fault recovery and power handling during standby. Task Manager is gaining richer hardware insight as well, with new NPU‑related columns and clearer views of neural engines on the Performance tab. Together, these changes underline that K2 is not just about raw speed; it is about making Windows 11 feel more immediate, transparent, and predictable in day‑to‑day use, especially for common actions like opening Start or launching frequently used applications.