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Node.js is fast. Bad code makes it slow. Stop guessing. Profile your code to find the real problem.
Use these tools to fix performance:
- Built-in profiler: See where your app spends time.
- Flame graphs: Use 0x or clinic.js to find hot spots.
- Event loop lag: Use process.hrtime.bigint() to check responsiveness.
- Heap snapshots: Use Chrome DevTools to find memory leaks.
- Async tracking: Use async_hooks or OpenTelemetry.
Check your database first. Most slow apps have bad queries. Look for N+1 patterns.
Profile in production. Dev environments are different. Use Datadog or N|Solid to verify your fixes.