Building Ultra-Low Latency APIs in Node.js with Native Modules and Worker Threads
summary
Claims measurable wins: replacing hot JS paths with N-API (Rust/C++) yields image blur 20 ms → 0.4 ms and whole-request latency from ~32 ms (blocked) or ~27 ms (worker_threads) down to ~1 ms native; converting HTML table parsing cuts a 4.5 KB page from 28 ms to 5.3 ms and a large page from 140 ms to 31 ms. Implementation uses worker_threads and worker pools to avoid event-loop stalls, shares memory with SharedArrayBuffer to avoid cloning, and diagnoses hotspots with autocannon + clinic.js + 0x.
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chapters (13)
- 0:00Introduction
- 1:28Why latency matters
- 3:31Node.js sweet spot
- 5:19CPU bottlenecks with threads
- 7:29Performance with native modules
- 8:54Architecture for lower latency
- 10:40Benchmarking tools
- 13:14Case study and demo
- 16:54Native vs threads benchmarks
- 18:27Implementation strategy
- 19:53Real-world with Rust
- 20:56Key takeaways
- 21:18Q&A
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