Drive Chrome or Firefox (Puppeteer), or profile Node in-process, to attribute layout, style, and paint work, rendering counts, CPU self-time, and allocation back to source lines, with isolated timing and CI gating
Latest release v1.5.0 · 6 Sept 2026
2 files for Codex, OpenCode and Claude Code: web-performance-debugger AGENTS.md, web-performance-debugger CLAUDE.md — 12,343 tokens loaded in every session.
AGENTS.md A 1,088 tok CLAUDE.md C 11,255 tok These files are jantimon/web-performance-debugger's own configuration — they tell Codex, OpenCode and Claude Code how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.