What is UserEventAgent-System?

UserEventAgent-System is an always-running process that reacts to system events on your Mac.

What does it do?

It loads small plugins that each handle a different type of event. When something happens on the system, the right plugin responds. Events include:

• A disk being plugged in or removed
• Network settings changing
• A user logging in or out
• The Mac going to sleep or waking up
• A Bluetooth device connecting
• System settings being updated

Why plugins?

Instead of running a separate process for every kind of event, macOS loads many small handlers inside one process. This keeps the number of running processes down while still covering a wide range of events.

Does it use many resources?

Normally very little. It wakes briefly to handle an event and then goes back to waiting. If a plugin has a bug, UserEventAgent-System may use more resources than normal.

Should you worry?

No. It is a core part of how macOS responds to system events.

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