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WWDC 2025 - Optimize SwiftUI performance with Instruments
- Instruments 26 introduces a dedicated SwiftUI instrument to optimize performance by addressing issues like long view body updates and unnecessary view updates.
- Common performance problems in SwiftUI apps include delays in animations due to slow view body computations and unnecessary view updates.
- The SwiftUI instrument in Instruments 26 offers tracking lanes for Update Groups, Long View Body Updates, Long Representable Updates, and Other Long Updates.
- Diagnosing long view body updates involves moving expensive computations out of view bodies and into cached, pre-calculated values to optimize performance.
- SwiftUI's declarative nature uses AttributeGraph to manage dependencies between views efficiently and optimize updates.
- The Cause & Effect Graph in the new SwiftUI instrument visualizes update relationships, helping identify unnecessary updates for optimization.
- Creating granular data dependencies in SwiftUI minimizes unnecessary view updates and optimizes performance effectively.
- Avoid storing frequently changing values in the SwiftUI Environment to prevent performance issues across multiple views.
- Best practices for optimizing SwiftUI performance include keeping view bodies fast, designing granular data flow, profiling early, and understanding the render loop.
- To utilize the new SwiftUI instrument, developers can install Xcode 26 and update test devices to start profiling and optimizing SwiftUI apps for improved performance.
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