What KB5089573 and Low Latency Profile Change
Low Latency Profile in Windows 11 is a CPU boost mode introduced with the KB5089573 update that uses short, high-speed bursts to accelerate core interface actions such as opening apps, Start menu, search, and system flyouts, improving perceived responsiveness without permanently raising power consumption. Microsoft describes KB5089573 as an update that “accelerates app launch and core shell experiences such as Start menu, Search, and Action Center,” and independent testing from Windows Central reports system flyouts up to 70% faster and app launches up to 40% faster. This Windows 11 performance boost is part of Microsoft’s K2 initiative, which shifts focus from adding features to improving foundational operating system speed and responsiveness. KB5089573 also includes around 30 reliability and quality-of-life fixes, so users may notice smoother authentication, better device behavior, and fewer glitches alongside the faster menus.
How Low Latency Profile’s CPU Boost Mode Works
Low Latency Profile is a CPU boost mode designed to shave milliseconds off actions that users feel most, like opening Start or launching an app. When you trigger a high-priority action, LLP pushes the CPU to its maximum boost frequency for roughly one to three seconds. According to reports highlighted by Windows Latest and PCMag, this short burst is enough to remove UI lag on lower-end hardware without significantly harming battery life. The CPU boost window is deliberately brief, so fans and thermals stay under control and power draw returns to normal once the action finishes. Microsoft VP Scott Hanselman has framed LLP as a way for Windows to temporarily prioritize interactive work so common tasks complete faster. The same CPU-burst approach is already common on Android devices, Macs, and Linux desktops, and LLP brings Windows 11 closer to that behavior.
Real‑World Gains: Start, Search, Flyouts and App Launches
In practice, the main Windows 11 performance boost shows up in the shell: Start, Search, Action Center, notifications, and system flyouts. Windows Central’s testing tied Low Latency Profile to “40% faster launches and 70% faster menus,” though Microsoft notes that real-world results can vary. Low-end and mid-range PCs stand to benefit the most, because their CPUs spend more time ramping up under normal conditions. With LLP, that ramp is front‑loaded, so opening the Start menu or tapping a notification feels snappier and more consistent. Right-click context menus and other shell surfaces also gain from the same CPU burst behavior. For now, Microsoft says Low Latency Profile accelerates Start and native Windows tools first, with broader support for third‑party apps planned for a future update, so the biggest difference today shows up in built‑in experiences.
Rollout, Optional Preview Status, and Inconsistent Activation
KB5089573 arrives as an optional preview rather than a mandatory patch, so users need to manually select it in Windows Update or download it from the Update Catalog. Even after installation, Low Latency Profile is on a phased rollout, which means the CPU boost mode may not activate immediately on every device. Some users might see the reliability fixes and new features first, then notice faster app launches later as Microsoft flips server-side switches. Advanced users who do not want to wait can force-enable LLP using ViveTool, though this requires command-line steps and carries the usual preview risks. This staggered approach reflects Microsoft’s narrower Insider and preview paths, where the behavior of features like LLP can be refined separately from the base build, helping the company watch for regressions while it pushes a major performance initiative.
Beyond Speed: Other Improvements in KB5089573
While Low Latency Profile is the headline feature, KB5089573 also brings several practical upgrades. Windows Hello face and fingerprint sign-in now remain the default method even if users briefly switch to another option, and repeated PIN entry keeps the system on PIN until changed manually. New Shared Audio support lets two pairs of Bluetooth headphones share the same audio using Bluetooth LE Audio broadcast, which is useful for split-screen gaming or watching movies together. Displays connected through USB4 docks should wake more reliably, and improvements to the USB3 stack and sensor hub power handling aim to prevent crashes and reduce standby battery drain. Task Manager gains clearer NPU performance reporting, and Secure Boot certificate distribution is refined so more eligible devices receive updated certificates automatically. Together, these changes make KB5089573 more than a speed tweak; it is a broad stability and usability update.
