The Importance of Not Over-Optimizing in Rust
summary
A concrete example shows using the serde crate to parse JSON into structs with owned String fields then changing to borrowed strings with lifetimes yields about a 1.5x speedup over the owning version, while the original Rust version already runs nearly 20x faster than Python for the sample. Advice includes prefer owned values early, use clone or wrap shared data in Rc/Arc, and always benchmark with release optimizations enabled.
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