Tailwind CSS Performance Optimization v4 Performance Improvements Tailwind CSS v4 features a completely rewritten engine in Rust: | Metric | v3 | v4 | |--------|----|----| | Full builds | Baseline | Up to 5x faster | | Incremental builds | Milliseconds | Microseconds (100x+) | | Engine | JavaScript | Rust | JIT (Just-In-Time) Compilation How JIT Works JIT generates styles on-demand as classes are discovered in your files: 1. Scans source files for class names 2. Generates only the CSS you use 3. Produces minimal, optimized output v4: Always JIT Unlike v3, JIT is always enabled in v4—no config…