how to improve swift concurrency performance?
Asked on 06/16/2025
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To improve Swift concurrency performance, you can follow several strategies discussed in the WWDC sessions:
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Move Code Off the Main Thread: Identify and move non-UI related code off the main thread to improve app responsiveness. This can be done by using Swift Concurrency to separate tasks that can run concurrently or asynchronously. For example, network requests or expensive computations can be offloaded to background threads. This is discussed in the session Embracing Swift concurrency.
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Use the MainActor Appropriately: For Swift modules that primarily interact with the UI, set the default actor isolation to
MainActor. This ensures that UI updates are handled on the main thread, while other tasks can be offloaded to background threads. This approach is recommended in the session Embracing Swift concurrency. -
Profile and Optimize: Use profiling tools to identify performance bottlenecks and understand where your tasks might be off CPU. This can help you determine if there are APIs being misused or if there are too many threads being created. The session Optimize CPU performance with Instruments provides insights into using these tools effectively.
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Adopt Structured Concurrency: Structured concurrency helps manage asynchronous tasks and prevent data races. It allows you to offload tasks to the background while maintaining data safety. The session Code-along: Elevate an app with Swift concurrency provides a practical guide on how to implement this in your app.
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Enable Approachable Concurrency Settings: Use the "Approachable Concurrency" setting in your build configuration to enable features that make working with concurrency easier. This is particularly useful for projects that are new to concurrency.
By following these strategies, you can improve the performance and responsiveness of your Swift applications using concurrency.
Embracing Swift concurrency
Join us to learn the core Swift concurrency concepts. Concurrency helps you improve app responsiveness and performance, and Swift is designed to make asynchronous and concurrent code easier to write correctly. We’ll cover the steps you need to take an app through from single-threaded to concurrent. We’ll also help you determine how and when to make the best use of Swift concurrency features – whether it’s making your code more asynchronous, moving it to the background, or sharing data across concurrent tasks.
Explore concurrency in SwiftUI
Discover how SwiftUI leverages Swift concurrency to build safe and responsive apps. Explore how SwiftUI uses the main actor by default and offloads work to other actors. Learn how to interpret concurrency annotations and manage async tasks with SwiftUI’s event loop for smooth animations and UI updates. You’ll leave knowing how to avoid data races and write code fearlessly.
Optimize CPU performance with Instruments
Learn how to optimize your app for Apple silicon with two new hardware-assisted tools in Instruments. We’ll start by covering how to profile your app, then dive deeper by showing every single function called with Processor Trace. We’ll also discuss how to use CPU Counters’ modes to analyze your code for CPU bottlenecks.