performance testing

Performance testing was discussed in the context of Swift testing and Xcode at WWDC 2024. Here are some key points:

1. Parallel Testing in Swift: Swift testing now supports parallel testing by default, which can significantly reduce execution time, especially in continuous integration (CI) environments. This is a shift from XCtest, which only supports parallelization using multiple processes. Parallel testing helps in identifying hidden dependencies between tests and ensures faster feedback on test results. You can learn more about this in the session Go further with Swift Testing (21:09).

2. Performance Tools in Xcode: Xcode 16 introduces new tools and improvements for diagnosing performance issues. For instance, the session "What’s new in Xcode 16" discusses using tools like Instruments to diagnose performance problems, which can help in identifying areas for algorithmic improvements. This is crucial when your app's performance is not meeting expectations, such as slow UI interactions or excessive power consumption.

3. Swift Performance Exploration: The session "Explore Swift performance" delves into understanding performance as a multidimensional and situational aspect. It emphasizes using tools like Instruments to measure performance and identify areas for improvement, often through algorithmic changes rather than low-level code optimizations.

For more detailed insights, you can refer to the sessions mentioned above, which cover various aspects of performance testing and optimization in Swift and Xcode.