JavaScript Bundle Size Exceeds Vercel Limit
Your Next.js application has excessive JavaScript bundle size, causing slow page loads, poor Core Web Vitals scores, and potential Vercel function timeout issues. Build analysis shows bloated chunks.
Bundle size grows from unused dependencies, large libraries, lack of code splitting, or importing entire libraries instead of specific utilities.
Error Messages You Might See
Common Causes
- Importing entire libraries (lodash, date-fns) instead of specific functions
- Heavy dependencies without tree-shaking: moment.js, jQuery, momentjs alternatives
- Dynamic imports not configured, causing all routes bundled together
- Node modules accidentally included in client bundle
- No lazy loading for heavy components (charts, editors, maps)
How to Fix It
Analyze bundle: Use npm run build then npx next/bundle-analyzer to see what's bloating bundle.
Replace heavy libs: Swap moment.js for date-fns or dayjs, lodash for lodash-es with tree-shaking.
Lazy load components: Use dynamic imports for heavy components:const Chart = dynamic(() => import('@/components/Chart'), { ssr: false })
Check imports: Replace import _ from 'lodash' with import pick from 'lodash/pick'
Real developers can help you.
Sage Fulcher
Hey I'm Sage! Im a Boston area software engineer who grew up in South Florida. Ive worked at a ton of cool places like a telehealth kidney care startup that took part in a billion dollar merger (Cricket health/Interwell health), a boutique design agency where I got to work on a ton of exciting startups including a photography education app, a collegiate Esports league and more (Philosophie), a data analytics as a service startup in Cambridge (MA) as well as at Phillips and MIT Lincoln Lab where I designed and developed novel network security visualizations and analytics. I've been writing code and furiously devoted to using computers to make people’s lives easier for about 17 years. My degree is in making computers make pretty lights and sounds. Outside of work I love hip hop, the Celtics, professional wrestling, magic the gathering, photography, drumming, and guitars (both making and playing them)
Stanislav Prigodich
15+ years building iOS and web apps at startups and enterprise companies. I want to use that experience to help builders ship real products - when something breaks, I'm here to fix it.
Jared Hasson
Full time lead founding dev at a cyber security saas startup, with 10 yoe and a bachelor's in CS. Building & debugging software products is what I've spent my time on for forever
legrab
I'll fill this later
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.
Basel Issmail
’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems.
My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale.
In addition to development, I often collaborate closely with product managers, business analysts, designers, and QA teams to ensure that solutions align with both technical and business goals.
I enjoy working with startups and product teams where I can contribute both as a hands-on engineer and as a technical partner in designing and delivering impactful software.
PawelPloszaj
I'm fronted developer with 10+ years of experience with big projects. I have small backend background too
Rudra Bhikadiya
I build and fix web apps across Next.js, Node.js, and DBs.
Comfortable jumping into messy code, broken APIs, and mysterious bugs.
If your project works in theory but not in reality, I help close that gap.
Dor Yaloz
SW engineer with 6+ years of experience,
I worked with React/Node/Python
did projects with React+Capacitor.js for ios
Supabase expert
Kingsley Omage
Fullstack software engineer passionate about AI Agents, blockchain, LLMs.
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
How big should my JavaScript bundle be?
Aim for <100KB main bundle. First-party code usually <50KB, dependencies <50KB. Use bundle analyzer to identify large packages.
What's the fastest way to reduce bundle?
Replace moment.js (67KB) with date-fns (13KB). Remove unused dependencies. Lazy load below-fold components.
How do I enable tree-shaking?
Ensure package.json has 'sideEffects': false. Use ES modules for imports. Webpack automatically tree-shakes unused code.