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# qualityOfService

A value of type `NSQualityOfService`, which controls how aggressively the system schedules the activity.

```
var qualityOfService: QualityOfService { get set }
```

## Discussion

Options include:

- NSQualityOfServiceUserInteractive
- NSQualityOfServiceUserInitiated
- NSQualityOfServiceUtility
- NSQualityOfServiceBackground

The default value is `NSQualityOfServiceBackground`. If you upgrade the quality of service above this level, the system schedules the activity more aggressively. The default value is the recommended value for most activities. See [`Configure Scheduler Properties`](/documentation/Foundation/NSBackgroundActivityScheduler#Configure-Scheduler-Properties). For information about quality of service, see [Prioritize Work at the Task Level](https://developer.apple.com/library/archive/documentation/Performance/Conceptual/power_efficiency_guidelines_osx/PrioritizeWorkAtTheTaskLevel.html#//apple_ref/doc/uid/TP40013929-CH35) in [Energy Efficiency Guide for Mac Apps](https://developer.apple.com/library/archive/documentation/Performance/Conceptual/power_efficiency_guidelines_osx/index.html#//apple_ref/doc/uid/TP40013929).

---

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