Slow Bundle Build Time - Build Takes Too Long
Your Bolt app takes minutes to build even with small changes. Development speed suffers with slow hot reload and rebuild times.
npm run dev or npm run build takes excessive time (over 30 seconds for simple changes).
Error Messages You Might See
Common Causes
- Too many dependencies or heavy packages being bundled
- Webpack/Next.js not optimized - missing splitting or lazy loading
- Large image assets in bundle instead of optimized
- Development mode compiling all unused code
- TypeScript checking every file on each change
How to Fix It
Analyze bundle: npm run build -- --analyze to see what's large
Remove unused dependencies: npx depcheck
Use dynamic imports for heavy libraries: import('heavy-lib').then(mod => mod.default)
Enable SWC minifier in next.config.js for faster builds
Split code: ensure lazy loading of routes and components
For dev: use --turbo flag if using Next.js 13+
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Get HelpFrequently Asked Questions
What's a good target build time?
Dev mode cold start: <10s. Hot reload: <2s. Full build: <20s
How do I find what's slowing builds?
npm run build -- --analyze or npm run build --profile to see bottlenecks
Does using less packages help?
Yes significantly. Each dependency adds parsing time. Prefer lighter alternatives or inline small utilities