How to profile Rust code

Use cargo flamegraph to generate a visual performance profile of your Rust code. First, install the tool with cargo install cargo-flamegraph, then run cargo flamegraph --bin <your_binary_name> to compile your project with debug info and generate a flamegraph.svg file showing function call hierarchies and execution time.

Profiling is like using a speed camera to find exactly where your code is slowing down. It helps you see which parts of your program take the most time to run so you can fix the bottlenecks. You use this when your application feels sluggish and you need to make it faster.