Busting Performance Bottlenecks: Improving Boot Time by 60%
summary
Claims a 60%+ startup speedup by building a file/constant and bytecode cache and by optimizing Bundler. Uses the boot snap gem to cache Ruby instruction sequences via Ruby iseq, replace YAML with Marshal/messagepack for config fixtures, and override require/load to eliminate O(n^2) lookups. Bundler work in Bundler 1.15 cuts its startup from ~1s to ~300ms; a monolith drops from ~25s to ~6.5s. Timing helpers and Gantt charts find hotspots; changes are implemented and show reproducible wins.
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chapters (11)
- 0:00Introduction and speaker intro
- 1:47What is application boot time
- 6:01Areas of impact in boot time
- 8:09How boot snap caching works
- 12:04Caching serialization and config
- 15:17Bundler performance optimizations
- 20:59Finding inefficiencies with timing tools
- 27:30Demo of timing helpers and Gantt charts
- 32:16Methodologies for performance tracing
- 33:21Open source contributions and call to action
- 36:41Q&A on boot snap and production use
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