give me tips to improve my build time
Generated on 5/9/2025
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To improve your build time, you can consider the following tips based on the content presented at WWDC:
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Use Explicitly Built Modules: This feature in Xcode 16 improves parallelism, provides better diagnostics, and speeds up debugging. For C and Objective-C, explicit modules are on by default, but for Swift, you'll need to opt in. You can enable explicitly built modules in your build settings. This change allows the build system to control module builds, which can lead to more efficient builds (What’s new in Xcode 16).
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Optimize Module Variants: By making your settings uniform across your project, you can reduce the number of module variants that get built. This allows modules built for a given source file to be shared across targets, which can help in reducing build times (Demystify explicitly built modules).
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Improve Swift Package Integration: Xcode 16 has improvements in Swift package integration, allowing you to queue up builds without waiting for package resolution to finish first. This can streamline your build process and save time (What’s new in Xcode 16).
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Utilize Xcode Cloud: If you're using Xcode Cloud, you can scale your workflows as your app grows. This includes defining environment variables, start conditions, build actions, and post actions to optimize your build process (Extend your Xcode Cloud workflows).
By implementing these strategies, you can potentially improve your build times and make your development process more efficient.
Extend your Xcode Cloud workflows
Discover how Xcode Cloud can adapt to your development needs. We’ll show you how to streamline your workflows, automate testing and distribution with start conditions, custom aliases, custom scripts, webhooks, and the App Store Connect API.
Break into the RealityKit debugger
Meet the RealityKit debugger and discover how this new tool lets you inspect the entity hierarchy of spatial apps, debug rogue transformations, find missing entities, and detect which parts of your code are causing problems for your systems.
What’s new in Swift
Join us for an update on Swift. We’ll briefly go through a history of Swift over the past decade, and show you how the community has grown through workgroups, expanded the package ecosystem, and increased platform support. We’ll introduce you to a new language mode that achieves data-race safety by default, and a language subset that lets you run Swift on highly constrained systems. We’ll also explore some language updates including noncopyable types, typed throws, and improved C++ interoperability.
Demystify explicitly built modules
Explore how builds are changing in Xcode 16 with explicitly built modules. Discover how modules are used to build your code, how explicitly built modules improve transparency in compilation tasks, and how you can optimize your build by sharing modules across targets.
Deploy machine learning and AI models on-device with Core ML
Learn new ways to optimize speed and memory performance when you convert and run machine learning and AI models through Core ML. We’ll cover new options for model representations, performance insights, execution, and model stitching which can be used together to create compelling and private on-device experiences.
What’s new in Xcode 16
Discover the latest productivity and performance improvements in Xcode 16. Learn about enhancements to code completion, diagnostics, and Xcode Previews. Find out more about updates in builds and explore improvements in debugging and Instruments.
Train your machine learning and AI models on Apple GPUs
Learn how to train your models on Apple Silicon with Metal for PyTorch, JAX and TensorFlow. Take advantage of new attention operations and quantization support for improved transformer model performance on your devices.
Optimize your 3D assets for spatial computing
Dive into an end-to-end workflow for optimized 3D asset creation. Discover best practices for optimizing meshes, materials, and textures in your digital content creation tool. Learn how to harness shader graph, baking, and material instances to enhance your 3D scene while optimizing performance. Take advantage of native tools to work more effectively with your assets and improve your app’s performance.