Windows 11 August Update Speeds App Launches With 1-3 Second CPU Boost

Q: Will the new Low Latency Profile actually rescue aging PCs, or is it just a temporary fix before the 24H2 support cutoff?

It can help aging PCs feel quicker, but it is not a rescue plan for keeping 24H2 viable past its support deadline. What Microsoft is shipping in KB5121003 is an expansion of the Low Latency Profile to apps, designed to ramp CPU performance faster during launches. Reporting and testing around the feature suggest it works best on lower-end systems, especially older machines with modest CPUs and 8GB of RAM, where short bursts of CPU scheduling can reduce the sluggishness users notice when opening the Start menu, notifications, and eventually apps. On newer or more powerful PCs, the effect is often barely noticeable. That said, the feature is a responsiveness boost, not a broad performance overhaul. It does not add RAM, replace a slow SSD, fix thermal throttling, or solve years of software clutter. It briefly increases CPU utilization for a few seconds, so it can smooth launch behavior, but it will not transform an underpowered PC into a modern one. It also should not be viewed as a stopgap for staying on Windows 11 24H2. Microsoft has already confirmed 24H2 Home and Pro support ends on October 13, 2026. Since 24H2 and 25H2 share the same platform and Microsoft says the upgrade path is small and low risk, the practical answer is to move eligible systems to 25H2 rather than rely on Low Latency Profile as a workaround. In short, Low Latency Profile is a useful quality-of-life improvement for older hardware, but support lifecycle and underlying hardware limits still matter more.

3 articles · Updated · WindowsLatest · Aug 12

KB5121003 in Windows 11 Build 26200.9168 and newer now extends Low Latency Profile to app launches, making tested apps open noticeably faster after installation.
The feature spikes CPU frequency to near maximum for 1-3 seconds when an app is opened, then quickly drops back to idle — a "race to sleep" approach Microsoft says can improve responsiveness without raising overall power use.
Tests on an Intel Core i5-13420H showed P-cores jumping close to 4.6GHz and E-cores above 2GHz, with faster launches for apps including Chrome, PowerPoint, VLC and Epic Games Store.
Microsoft is rolling the change out gradually through Controlled Feature Rollout, so some PCs may not get it immediately even after installing the August security update.
The performance tweak arrives inside the same August Patch Tuesday release Microsoft is pushing for security reasons, after urging users to install fixes for 421 vulnerabilities.

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