fbuild Blink build benchmark

Generated 2026-07-22T19:48:08Z from 96a128ed01e675e51a08c775be2277291df2404c. Median of 3 trials on linux/x86_64.

All three tools compile the same Arduino Uno bench/blink/blink.ino. Cold removes project outputs and matching compiled framework caches while retaining installed packages and global download/compiler caches. Warm is the immediate no-change rebuild. The narrower warm bar overlays the cold bar.

Arduino CLI vs PlatformIO vs fbuild cold and warm Blink build timings

Tool	Cold median	Warm median	Cold / warm	Version
Arduino CLI	681.844 ms	337.164 ms	2.02x	arduino-cli Version: 1.5.0 Commit: dd407d42d Date: 2026-05-19T14:07:51Z
PlatformIO	888.056 ms	634.069 ms	1.40x	PlatformIO Core, version 6.1.19
fbuild	79.787 ms	51.224 ms	1.56x	fbuild 2.5.3

Machine-readable data

manifest.json — stable discovery index for agents
latest.json — metadata, raw trials, and medians
history.jsonl — rolling 365-run history

Benchmark workflow run | one-commit publication branch