What Windows 11 Low Latency Profile Is and Why It Matters
Windows 11 Low Latency Profile is a performance feature introduced with the KB5089573 update that uses short, targeted CPU bursts to make common actions like launching apps and opening system menus feel faster and more responsive without permanently increasing processor load. Instead of spreading CPU work evenly, Windows briefly prioritizes interactive tasks so that app launch and menu rendering complete sooner, then drops back to normal behavior. According to WinBuzzer, testing tied Low Latency Profile to “up to 40% faster launches and 70% faster menus,” although real-world gains can vary by device. The feature focuses on core shell experiences such as Start, Search, Action Center, and context menus, aiming to cut UI lag that many users notice during everyday use rather than boosting heavy workloads like video encoding or gaming.
What the KB5089573 Update Changes Under the Hood
The KB5089573 update arrives as an optional preview for supported Windows 11 builds, meaning you must choose to install it from Windows Update rather than waiting for it as a mandatory security patch. At the heart of the release is Low Latency Profile, which uses CPU burst mode for one to three seconds during high-priority actions such as opening apps or system menus. This behavior is designed to reduce lag while keeping overall power and thermal impact short-lived. The update also includes broader quality-of-life changes, including Bluetooth LE Audio shared audio, expanded NPU monitoring columns in Task Manager, and reliability fixes for USB, sensors, input, and File Explorer. The Register notes that Microsoft also promises faster “core shell experiences” like the Start menu, even though the company has not fully detailed every internal optimization driving those improvements.
How to Install KB5089573 to Get Low Latency Profile
To try Windows 11 Low Latency Profile, start by installing the KB5089573 update. Open Settings, go to Windows Update, and select Check for updates. When KB5089573 appears as an optional preview, choose Download and install, then restart when prompted. You can also fetch the package from the Microsoft Update Catalog if you prefer manual installation, as WinBuzzer notes. Keep in mind this is a preview build, so it may not be as stable as a full security release. The Register highlights a known issue where devices with very limited EFI System Partition space can hit error 0x800f0922 around 35–36% and roll back with a “Something didn’t go as planned. Undoing changes.” message. If you see that, free space on the EFI partition or wait for Microsoft’s promised fix in a future update.
Why Activation May Be Delayed and How to Confirm It
Installing KB5089573 does not guarantee that Windows 11 Low Latency Profile is active immediately. Microsoft is using a controlled feature rollout, so the feature flag for CPU burst mode may switch on days or weeks after the update lands on your device. WinBuzzer explains that some systems may see faster menus before app launches improve, and others may show no obvious change at first. To check, pay attention to how quickly Start, Search, Action Center, and your most-used apps open after a few reboots and some normal use. Advanced users can try measuring launch times with a stopwatch or benchmarking tool across several runs. For power users comfortable with unsupported tweaks, WinBuzzer notes that ViveTool with command ID 58989092 can force-enable the hidden feature, but this remains outside Microsoft’s normal update path and carries extra risk.
Advanced Tips, Caveats, and When to Skip It for Now
Because KB5089573 is a preview, you should weigh the benefit of faster app launches against potential instability. If your system is mission-critical or you have very limited EFI System Partition space, you may want to wait until Microsoft ships a non-preview release that includes a fix for the 0x800f0922 rollback problem highlighted by The Register. After installation, remember that Low Latency Profile focuses on perceived responsiveness, not raw performance in demanding workloads. You may notice snappier Start and context menus without any difference in heavy tasks. If your machine supports Bluetooth LE Audio or has an NPU, you also gain shared audio streaming and richer Task Manager monitoring as part of this update. If, after some time, you do not notice faster app launches, it likely means the feature flag has not reached your device yet rather than something being misconfigured.