<!--
{
  "availability" : [
    "iOS: 18.0.0 -",
    "iPadOS: 18.0.0 -",
    "tvOS: 18.0.0 -",
    "visionOS: 2.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "UIKit",
  "identifier" : "/documentation/UIKit/UIUpdateInfo/isPerformingLowLatencyPhases",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "UIKit"
    ],
    "preciseIdentifier" : "c:objc(cs)UIUpdateInfo(py)performingLowLatencyPhases"
  },
  "title" : "isPerformingLowLatencyPhases"
}
-->

# isPerformingLowLatencyPhases

A Boolean value that indicates whether the UI update is in the low-latency phases.

```
var isPerformingLowLatencyPhases: Bool { get }
```

## Discussion

The value of this property is <doc://com.apple.documentation/documentation/Swift/true> between the [`beforeLowLatencyEventDispatch`](/documentation/UIKit/UIUpdateActionPhase/beforeLowLatencyEventDispatch) and [`afterLowLatencyCATransactionCommit`](/documentation/UIKit/UIUpdateActionPhase/afterLowLatencyCATransactionCommit) UI update phases. Keep any code you run in this part of the UI update as minimal as possible, especially when [`isImmediatePresentationExpected`](/documentation/UIKit/UIUpdateInfo/isImmediatePresentationExpected) is `true`. Defer any processing that isn’t critical for the current UI update until [`afterLowLatencyCATransactionCommit`](/documentation/UIKit/UIUpdateActionPhase/afterLowLatencyCATransactionCommit).

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)