I made a build visualizer to understand Bun's compile times

The author created buildprof, an open-source tracing tool that visualizes where time is spent during software builds on Linux, making it easy to identify bottlenecks like poor parallelism or repeated work. They developed it to investigate Jarred Sumner's claim that Bun's Rust build was over 5× faster than its previous Zig build, suspecting that the difference in Link-Time Optimization strategies (Full LTO vs. ThinLTO) might explain much of the improvement. The tool allows developers to prepend `buildprof --` to any build command to see a timeline visualization of all processes and their durations.