优化 Swift 代码的内存使用和性能 总结下这篇 wwdc session

The session "Improve memory usage and performance with Swift" at WWDC 2025 focuses on enhancing the performance and memory efficiency of Swift code. Here are the key points covered in the session:

1. New Language Features: The session introduces new additions to Swift 6.2, such as inline arrays, span types, value generics, and non-escapable types. These features help in reducing unnecessary memory operations like retains and releases, and improve code exclusivity and uniqueness checks.

2. Advanced Techniques: It discusses advanced techniques to allow the Swift compiler to eliminate much of the automatic memory management work that occurs at runtime. This includes optimizations like Copy on Write for arrays, which delays duplication of elements until necessary.

3. Swift Binary Parsing Library: A new open-source library called Swift Binary Parsing is introduced, which leverages these new tools to make writing binary parsers both fast and safe.

4. Performance Analysis: The session emphasizes the importance of understanding where your code spends time and how to optimize it. It covers techniques for profiling and identifying performance bottlenecks.

5. Memory Management: The session also touches on the differences between stack and heap memory, and how reference counting can be optimized to reduce overhead.

For more detailed insights, you can watch the session Improve memory usage and performance with Swift (00:00:00).