# AirPlayXPCHelper

> The root process in macOS that runs AirPlay audio, reads audioLatencyMs and builds the audio engine.

Updated 2026-10-06. Canonical page: https://lagless.app/glossary/airplayxpchelper/

> `AirPlayXPCHelper` is a macOS background process, at `/usr/libexec/AirPlayXPCHelper`, that runs as root and handles AirPlay output. It reads `audioLatencyMs` from root's preferences and builds its audio engine once per process, so a new value needs a restart, which drops the current AirPlay route.

Related: [audioLatencyMs](/glossary/audiolatencyms/) · [audioLatencyMs explained](/guides/audiolatencyms-explained/) · Source: [Preroll notes](https://github.com/ksha23/preroll/blob/main/NOTES.md)