Bolt performance

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

Build taking over 60 seconds Hot module replacement slow Bundle size exceeded 500KB Compilation timeout
Build taking over 60 secondsHot module replacement slowBundle size exceeded 500KBCompilation timeout

Common Causes

  1. Too many dependencies or heavy packages being bundled
  2. Webpack/Next.js not optimized - missing splitting or lazy loading
  3. Large image assets in bundle instead of optimized
  4. Development mode compiling all unused code
  5. 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+

Real developers can help you.

Antriksh Narang Antriksh Narang 5 years+ Experienced Dev (Specially in Web Development), can help in python, javascript, react, next.js and full stack web dev technologies. Prakash Prajapati Prakash Prajapati I’m a Senior Python Developer specializing in building secure, scalable, and highly available systems. I work primarily with Python, Django, FastAPI, Docker, PostgreSQL, and modern AI tooling such as PydanticAI, focusing on clean architecture, strong design principles, and reliable DevOps practices. I enjoy solving complex engineering problems and designing systems that are maintainable, resilient, and built to scale. legrab legrab I'll fill this later Mehdi Ben Haddou Mehdi Ben Haddou - Founder of Chessigma (1M+ users) & many small projects - ex Founding Engineer @Uplane (YC F25) - ex Software Engineer @Amazon and @Booking.com Caio Rodrigues Caio Rodrigues I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures. I have strong experience working with **dynamic forms, state management (Redux / React Hook Form), and complex data-driven interfaces**. I enjoy solving real-world problems by turning ideas into reliable software that companies can actually use in their daily operations. Beyond coding, I care about **software quality and architecture**, following best practices for componentization, code organization, and performance optimization. I'm also comfortable working across the stack when needed, integrating APIs, handling business logic, and helping transform prototypes into production-ready systems. My goal is always to deliver solutions that are **simple, efficient, and genuinely useful for the people using them.** BurnHavoc BurnHavoc Been around fixing other peoples code for 20 years. Meïr Ankri Meïr Ankri Full-stack developer specializing in React / Next.js / Node.js with 6+ years of experience. I've worked across various sectors including automotive (Reezocar/Société Générale), healthcare (Medical Link SaaS), and e-commerce (Glasman). I build web apps end-to-end, from architecture to production, with a focus on scalability, performance, and code quality. I also mentor junior developers and contribute to technical decisions and code reviews. Tejas Chokhawala Tejas Chokhawala Full-stack engineer with 5 years experience building production web apps using React, Next.js and TypeScript. Focused on performance, clean architecture and shipping fast. Experienced with Supabase/Postgres backends, Stripe billing, and building AI-assisted developer tools. Alvin Voo Alvin Voo I’ve watched the tech landscape evolve over the last decade—from the structured days of Java Server Pages to the current "wild west" of Agentic-driven development. While AI can "vibe" a frontend into existence, I specialize in the architecture that keeps it from collapsing. My expertise lies in the critical backend infrastructure: the parts that must be fast, secure, and scalable. I thrive on high-pressure environments, such as when I had only three weeks to architect and launch an Ethereum redemption system with minimal prior crypto knowledge, turning it into a major revenue stream. What I bring to your project: Forensic Debugging: I don't just "patch" bugs; I use tools like Datadog and Explain Analyzers to map out bottlenecks and resolve root causes—like significantly reducing memory usage by optimizing complex DB joins. Full-Stack Context: Deep experience in Node.js and React, ensuring backends play perfectly with mobile and web teams. Sanity in the Age of AI: I bridge the gap between "best practices" and modern speed, ensuring your project isn't just built fast, but built to last. hanson1014 hanson1014 Full-stack developer experienced in fixing and deploying AI-generated apps from Lovable, Bolt.new, Cursor, and Replit. I specialize in debugging Supabase integration issues (auth flows, RLS policies, database connections), fixing broken deployments, resolving routing/blank screen problems, and cleaning up messy React/Vite codebases. I also build production apps with the Claude API and have shipped a Mac desktop dev tool (Nexterm from scratch. Based in Hong Kong, fast turnaround.

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Frequently 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

Related Bolt Issues

Can't fix it yourself?
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