What Low Latency Profile Is and Why It Matters
Low Latency Profile in Windows is a performance feature that triggers short CPU frequency spikes when you open apps or key interface elements, sharply reducing delays in common actions such as the Start menu, search, and notification panels. In the optional KB5089573 update for Windows 11, Microsoft codes this under “General Performance” improvements and ties it to its wider K2 performance initiative, which focuses on fixing foundational responsiveness instead of adding new features. Testing from Windows Central reports that system flyouts speed up by 70% and app launches by 40% once the Low Latency Profile Windows optimizations are active. In practice, that means Start menu performance feels closer to instant, search results appear faster, and the Action Center responds with fewer visible hiccups. For many users, this directly targets long-standing complaints that Windows 11 felt laggier than previous versions in everyday use.
How Low Latency Profile Uses CPU Boost Mode in Windows
At the core of Low Latency Profile is a CPU boost mode Windows can tap for one to three seconds whenever it detects latency‑sensitive actions. Reports cited by PCMag explain that the CPU ramps to its maximum boost frequency briefly when you open apps or trigger shell features like Start, Search, or Action Center. According to Windows Latest, this “temporarily pushes the CPU to higher frequencies for very short bursts” to make UI responses feel snappier without permanently overclocking your system. Wccftech notes that Windows Latest testing saw CPU usage spike up to 100% when opening the Action Center, which helped erase micro‑stutters in the Start menu. For now, Microsoft says the profile focuses on native shell experiences rather than third‑party apps, but broader support is planned. The design aims to use your CPU’s built‑in boost headroom in a controlled way instead of leaving performance on the table.
Real-World Gains: Faster App Launches and Smoother Start Menu
Microsoft’s changelog for KB5089573 highlights that the update “accelerates app launch and core shell experiences such as Start menu, Search, and Action Center.” Windows Central’s measurements show concrete gains: system flyouts like volume or network panels open up to 70% faster, while Windows 11 app launch speed improves by about 40%. These changes directly address everyday pain points—Start menu lag, sluggish search, and the slow feel of quick settings or notifications. With Low Latency Profile enabled, the Start menu stutter that has dogged Windows 11 is greatly reduced or eliminated, since each interaction triggers a brief CPU boost burst. Users also benefit from related optimizations in the same update: faster clipboard history, more responsive Windows Search that can find files from as few as two characters, and smoother Task Scheduler and Task Manager behavior. Together, they make the desktop shell feel lighter and more immediate.
How to Install KB5089573 and Enable Low Latency Profile
KB5089573 is an optional preview update, so Windows 11 will not install it automatically. To get it, open Settings, go to Windows Update, then Advanced options and Optional updates, and install the 2026-05 Preview Update (KB5089573) if it is listed. This update brings systems on supported versions (24H2 and 25H2) to builds such as 26200.8524 or 26100.8524, which are required for Low Latency Profile Windows features. However, Microsoft is rolling out the profile in stages, so even after installation the CPU boost feature might not activate immediately. Some users have forced early activation via ViVeTool, a third‑party utility that flips experimental feature flags, but this approach involves Command Prompt work and carries more risk. Wccftech notes that once Microsoft completes the rollout, Low Latency Profile will run by default with no visible toggle in standard Windows settings.
Rollout Caveats, Known Issues, and Other KB5089573 Improvements
Because KB5089573 is an optional preview and the Low Latency Profile rollout is staggered, not every installation will see immediate benefits. Some users report that the update appears to install and then quietly rolls back, so it is wise to recheck Windows Update history and confirm whether build 26200.8524 or 26100.8524 is active on your system. If Low Latency Profile still is not present, it may be waiting on a server‑side activation wave. Beyond CPU boost mode Windows enhancements, the update bundles over 30 other changes. Windows Hello now stays as the default sign‑in once chosen, Bluetooth LE Audio shared audio lets two headphone pairs listen to the same PC, and Windows Camera can stream to multiple apps at once. Task Manager gains improved NPU monitoring, USB4 display wake behavior is more reliable, and Secure Boot certificate targeting is refined. Even if Low Latency Profile takes time to arrive, KB5089573 is a substantial quality‑of‑life release.