Million.js
Drop-in React performance optimizer. Million.js replaces React's virtual DOM diffing algorithm with a hyper-optimized 'block virtual DOM' that's up to 70% faster for rendering. Works as a Babel/SWC compiler plugin — automatically wraps eligible React components in Million's faster renderer. No code changes required; install the package, add the plugin, and eligible components render faster. Used to speed up existing React applications without rewriting.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Build-time optimizer and client-side runtime. No network calls or data collection in free tier. MIT licensed and open source.
⚡ Reliability
Best When
You have a React app with performance issues caused by frequent re-renders and want to improve rendering speed without migrating away from React.
Avoid When
Your React app performance issues are from network, state management, or architecture — Million.js only helps with rendering; profile first.
Use Cases
- • Speed up existing React applications with a drop-in compiler plugin that automatically optimizes component rendering
- • Improve performance of data-heavy React UIs (tables, lists, dashboards) where frequent re-renders cause slowness
- • Add render performance to React apps without migrating to Solid.js or Preact — stay in React ecosystem
- • Optimize specific high-frequency components by manually wrapping them with block() for maximum performance
- • Profile React application render performance and identify components that benefit most from Million.js optimization
Not For
- • Applications with highly dynamic component trees — Million.js works best on components with stable structure and changing data
- • Replacing React entirely — Million.js is an enhancement, not a replacement; use Solid.js or Preact for fundamental paradigm changes
- • Server-side rendering optimizations — Million.js focuses on client-side rendering performance
Interface
Authentication
No authentication — build-time optimizer and runtime library.
Pricing
MIT licensed core. Million Lint (paid) provides IDE integration to identify performance bottlenecks. Core optimizer is free.
Agent Metadata
Known Gotchas
- ⚠ Million.js block() function has restrictions — components must be 'pure' with stable structure; hooks with side effects may cause issues
- ⚠ Not all React components are automatically optimizable — components using context, refs, or complex hooks may be skipped by the auto-optimizer
- ⚠ The 70% faster claim applies to specific benchmark scenarios — real-world improvement varies widely based on component patterns
- ⚠ Million.js compiler may transform code in unexpected ways — verify component behavior after enabling the plugin
- ⚠ React DevTools profiler numbers change when Million.js is active — measurement methodology must account for different rendering paths
- ⚠ Some React patterns (render props, HOCs with dynamic structures) are not compatible with block virtual DOM optimization
Alternatives
Full Evaluation Report
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Scores are editorial opinions as of 2026-03-07.