Replit performance

Slow Application Startup on Replit

Your app takes 30+ seconds to start, making development slow and deployments take forever. Startup time is unacceptable.

Spring Boot's autoconfiguration and component scanning cause slow initialization.

Common Causes

  1. Large number of beans and autoconfiguration
  2. Component scanning entire classpath
  3. Eager database connection initialization
  4. Loading all data on startup
  5. Hibernate scanning all entities

How to Fix It

Use spring-boot-starter-webflux for async. Defer non-critical beans with @Lazy. Exclude unnecessary autoconfiguration: @SpringBootApplication(exclude={...}). Move startup data loading to lazy-loaded service. Use spring.jpa.properties.hibernate.hbm2ddl.auto=validate instead of create/update. Profile startup with --debug flag.

Real developers can help you.

Kingsley Omage Kingsley Omage Fullstack software engineer passionate about AI Agents, blockchain, LLMs. 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. Basel Issmail 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. Victor Denisov Victor Denisov Developer prajwalfullstack prajwalfullstack Hi Im a full stack developer, a vibe coded MVP to Market ready product, I'm here to help 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. Bastien Labelle Bastien Labelle Full stack dev w/ 20+ years of experience Nam Tran Nam Tran 10 years as fullstack developer Stanislav Prigodich 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. MFox MFox Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking.

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Frequently Asked Questions

How do I measure startup time?

Use ./gradlew bootRun and check 'Started YourApp in X seconds'

Which beans can I mark @Lazy?

Non-critical services like schedulers, batch processors, external integrations

Related Replit Issues

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