- Dev build
- Local server
- HMR - Hot module replacement
- File watching algorithm - written in c++
- Faster build - because of caching in .parcel-cache
- Image optimization
- Minification
- Bundling
- Compressing
- Consistent hashing
- code splitting
- differential bundling - support older browsers
- Diagnostic
- Error Handling
- Https
- Tree shaking - remove unused code
- Different for dev and prod