swift concurrency performance improvement
Asked on 06/16/2025
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Swift concurrency has been a significant focus in recent WWDC sessions, with various improvements aimed at enhancing performance and making concurrency more approachable for developers. Here are some key points regarding Swift concurrency performance improvements:
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Concurrency in SwiftUI: SwiftUI leverages Swift concurrency to improve app performance by offloading compute tasks from the main thread. This is particularly useful for animations and other UI updates that require complex calculations. By performing these calculations on a background thread, SwiftUI helps maintain a smooth and responsive user interface. For more details, you can refer to the session Explore concurrency in SwiftUI (07:47).
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Embracing Swift Concurrency: This session discusses how Swift concurrency can be used to improve app performance by moving tasks off the main thread. It introduces the concept of using concurrency to handle high-latency operations and offload expensive computations to the background. The session also covers recommended build settings to facilitate the introduction of concurrency in your projects. You can learn more in the session Embracing Swift concurrency (26:37).
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Code-along: Elevate an App with Swift Concurrency: This session provides a practical demonstration of how to use Swift concurrency to enhance app performance. It includes techniques for preventing data races and optimizing tasks to run in parallel, which can significantly improve the responsiveness of your app. For a hands-on approach, check out the session Code-along: Elevate an app with Swift concurrency (20:07).
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What's New in Swift: The session highlights language changes in Swift 6.2 that make concurrency more approachable and safer by default. These changes help prevent data races and make it easier to write concurrent code without introducing runtime bugs. For more information, see the session What’s new in Swift (30:28).
These sessions collectively provide a comprehensive overview of how Swift concurrency can be leveraged to improve app performance, with practical examples and guidance on adopting these features in your projects.
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.
What’s new in Swift
Join us for an update on Swift. We’ll talk about workflow improvements that make you more productive, and new and modernized library APIs for fundamental programming tasks. We’ll show examples of Swift adoption throughout more layers of the software stack. Finally, we’ll explore new language features for both improving approachability of concurrency, and achieving peak performance when you need it.