https://developer.apple.com/documentation/foundation/operation/qualityofservice
qualityOfService | Apple Developer Documentation
The relative amount of importance for granting system resources to the operation.
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https://developer.apple.com/documentation/foundation/qualityofservice/userinitiated
QualityOfService.userInitiated | Apple Developer Documentation
There's never been a better time to develop for Apple platforms.
apple developerdocumentation