Lalit Maganti built buildprof, an open-source tracing tool that visualizes build timelines on Linux, showing where compile time is spent across processes, parallelism, and dependency work. The tool was inspired by claims that Bun's Rust build is >5× faster than its old Zig build, prompting investigation into LTO differences and build performance.
Background
Build performance profiling is a well-known pain point in software development, especially for large projects like Bun. Link-time optimization (LTO) is a common compiler optimization technique that lets separate compilation units optimize across boundaries.
- Source
- Lobsters
- Published
- Sep 12, 2026 at 10:48 PM
- Score
- 6.0 / 10