Cirno is an app freezer that runs on Android 12+ platforms, it is used to make background apps completely free of CPU resources to improve the overall smoothness of the device.

Cirno is currently only supported on cgroup v2 devices, which means your Linux kernel version needs to be greater than or equal to 5.0.

The app has no GUI. It will freeze apps automatically. By modifying the cfg file, you can specify that the application does not freeze.