Development Speed Optimizations in Rails 8
summary
Rails 8 lands concrete boot-time fixes: a new bin rails boot command for profiling with stackprof and SpeedScope, file-watcher changes that cut translation-watch time from ~500ms to ~90ms (roughly a 5x improvement), a lazy route set that defers drawing ~3,000 routes (avoiding ~460ms on boot), and a reworked initializer topological sort that eliminates a 750ms T‑sort for ~2,000 initializers (faster sort shipped in PR 53615 for Rails 8.1); Shopify drops from ~12.5s to ~3.5–4s.
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chapters (7)
- 0:00Introduction
- 2:30bin/rails boot and boot time
- 6:25File watching in Rails 8
- 11:48Lazy loading routes
- 17:48Faster initializer sorting
- 23:55Recap and impact of optimizations
- 25:29Q&A
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