Overview
- Microsoft flipped on Low Latency Profile for app launches with the August KB5121003 update, and the change is rolling out gradually through a controlled feature rollout.
- The feature briefly raises P‑core and E‑core clock speeds for about one to three seconds on user interaction so the system completes load work faster and then returns to low power.
- Independent before‑and‑after tests reported by Windows Latest and summarized by PCWorld observed immediate CPU frequency spikes and noticeably faster app start times, with the biggest gains on weaker or older PCs.
- The Windows Latest tester reported no measurable battery or thermal penalty in their checks, but availability varies by device and users can force the change using the third‑party ViVeTool tool with the feature ID 58989092 at their own risk.
- Microsoft frames this as one part of broader Windows 11 performance work, including memory optimizations and WinUI migrations, which could make everyday responsiveness feel faster as the rollout expands.