The Capability Access Manager Service (camsvc), which governs app permissions to privacy-sensitive capabilities like the camera, microphone, and location, can pin CPU usage between 80 and 100% under "Service Host" in Task Manager while other processes stay near 0-5%. The spikes cause noticeable lag, stutter, and occasional freezes, and are frequently reported alongside specific games such as the Saints Row franchise, though it also occurs outside gaming. Restarting the service or the PC provides only temporary relief before the high usage returns.
Steps to reproduce:
- Run Windows 11 (or Windows 10) with the Capability Access Manager Service enabled.
- Use apps or games that repeatedly request capability checks (camera/microphone/UWP permission checks), such as Saints Row titles.
- Observe Task Manager: "Service Host: Capability Access Manager Service" consumes 80-100% CPU while other processes remain low.
Solution: Not yet available. Microsoft support staff on its own Q&A forum have only pointed users to generic steps (install pending Windows updates, update device drivers, run SFC/DISM repairs), none of which reliably resolves the issue for affected users.
Workaround: Disabling the "Capability Access Manager Service" in Windows Services Manager drops CPU usage back to normal (e.g., ~7%), but breaks Microsoft Store and Store-distributed UWP apps, and can cause audio/microphone problems in other applications (e.g., Valorant voice chat).
Severity: Minor (degrades performance and causes lag/stutter, but does not crash the system, cause data loss, or pose a security risk; a workaround exists, though it has its own side effects)
First seen: 2022-03
Affected product: Windows
Affected versions: Reported across multiple Windows 10 and 11 builds since at least March 2022 through 2026; no specific version range isolated as the root cause
Fixed versions: Not yet available
Links:
- Capability Access Manager Service high CPU usage in Windows 11 – TheWindowsClub
- How to Fix Capability Access Manager Service High CPU Usage? – MiniTool
- How to fix Capability Access Manager Service high CPU usage in Windows? – UGetFix
- High CPU Usage by Capability Access Manager Service – Microsoft Q&A
- The "Service Host: Capability Access Manager Service" is causing my CPU Usage to hit 100% – Microsoft Q&A
- Service Host: Capability Access eating my CPU – Microsoft Q&A
- The "Service Host: Capability Access Manager Service" is causing my CPU Usage to hit 100% – Windows Phone Info forum (not verified)