---
title: systemPrefersReducedResourceUsage
framework: uikit
role: symbol
role_heading: Instance Property
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, tvOS 27.0+, visionOS 27.0+]
path: uikit/uiapplication/systemprefersreducedresourceusage
---

# systemPrefersReducedResourceUsage

A Boolean value that indicates whether the system prefers that the app reduce its resource usage.

## Declaration

```swift
var systemPrefersReducedResourceUsage: Bool { get }
```

## Discussion

Discussion When this value is YES, the system has entered a state where it would prefer apps to scale back resource-intensive work. Use this to avoid or reduce expensive work. For example: Gate or simplify resource-intensive UI, such as 3D or AR viewers, advanced camera modes, or live effects. Choose lighter-weight paths, such as lower-resolution assets or fewer simultaneous operations. Defer or shrink non-essential background work, such as prefetching or precomputation. Avoid performing or scheduling expensive work in response to changes in this property, as this could worsen resource usage. tip: For in-memory caching, consider using NSCache with NSPurgeableData, which automatically evicts entries under system memory pressure. Use systemPrefersReducedResourceUsage for higher-level decisions that NSCache cannot make on its own. To respond to changes in views, read the UITraitCollection/systemPrefersReducedResourceUsage trait. From other contexts, observe systemPrefersReducedResourceUsageDidChangeNotification and re-read this property.