Optimizing Magic.dev-Generated Code for Performance

Magic.dev's codebase-wide understanding may lead it to choose architecturally clean approaches that are less performant than less elegant alternatives. Large-context generation for performance-critical code needs performance requirements explicitly stated

Profile generated code in performance-critical areas. State performance requirements explicitly in the task description. Use existing benchmarks and profiling to verify that broad refactors don't introduce performance regressions

Before optimizing, measure. Use your browser's Lighthouse audit to get a baseline score. Check Core Web Vitals (LCP, FID, CLS) — these directly affect your Google ranking. Use the Performance tab in DevTools to identify which components take the longest to render. For server-side performance, add timing logs to API routes to find slow endpoints.

The fastest way to improve performance: optimize and lazy-load images, enable compression on your server, remove unused CSS and JavaScript, implement code splitting so users only download code for the page they're viewing, and add proper caching headers for static assets. These changes alone can cut load times significantly.

If your Magic.dev app uses a database, slow queries are often the biggest performance bottleneck. Add indexes on columns you filter or sort by. Use SELECT to fetch only the columns you need instead of SELECT *. Implement pagination for lists — loading 10,000 rows at once will always be slow. Consider adding a caching layer for data that doesn't change frequently.