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

Lalit Maganti open-sourced buildprof, a Linux build tracing tool that records every process start and end time and lays them on a timeline. He used it to reproduce Bun's compile-time drop from 24m24s (Zig) to 5m40s (Rust) and found the key difference was Full LTO vs ThinLTO. Works with Cargo, Make, Ninja, and any build system that spawns processes.