v0
performance
Vercel Serverless Function Timeout
Your Vercel serverless functions timeout before completing (504 Gateway Timeout), cutting off long-running operations like data processing, report generation, or large data fetches.
Timeouts occur when functions exceed Vercel's limits (10 seconds for Hobby, 60 seconds for Pro), or when operations are inherently slow.
Error Messages You Might See
504 Gateway Timeout
Function execution timeout
[Vercel] Task timed out
Kill signal received
Common Causes
- Long-running operations not fitting within timeout limits
- External API calls not timing out, blocking function execution
- Large data processing, image manipulation, or file generation taking too long
- Database queries slow due to missing indexes or N+1 queries
- Not using Vercel's async job queue or background jobs for long tasks
How to Fix It
Upgrade plan: Hobby plan has 10s limit, Pro has 60s. Check plan limits in Vercel docs.
Add timeouts: Set timeout on external calls: const res = await fetch(url, { signal: AbortSignal.timeout(5000) })
Use background jobs: For tasks > 60s, use Vercel's Cron or external job queue (Bull, Inngest).
Optimize queries: Add database indexes, fix N+1 queries, use caching to speed up slow operations.
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)
Milan Surelia
Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems.
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🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX.
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Nam Tran
10 years as fullstack developer
Kingsley Omage
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Franck Plazanet
I am a Strategic Engineering Leader with over 8 years of experience building high-availability enterprise systems and scaling high-performing technical teams. My focus is on bridging the gap between complex technology and business growth.
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Embedded Engineer specilizing in perception systems. Latest project was a adas camera calibration system.
Luca Liberati
I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
Vlad Temian
15+ years shipping production infrastructure for startups. Former CTO at qed.builders (acquired by The Sandbox).
Cursor ambassador and agentic tooling builder.
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Taufan
I’m a product-focused engineer and tech leader who builds scalable systems and turns ideas into production-ready platforms.
Over the past years, I’ve worked across startups and fast-moving teams, leading backend architecture, improving system reliability, and shipping products used by thousands of users. My strength is not just writing code — but connecting product vision, technical execution, and business impact.
Jacek Rozanski
Senior PHP/Symfony developer and DevOps engineer with 20+ years of professional experience, running opcode.pl (web development agency, est. 2004).
Day job: I'm the sole backend developer at merketing company where I own and maintain 11 PHP/Symfony microservices on AWS (ECS Fargate, RDS, S3, CloudFront), handle the full CI/CD pipeline (Bitbucket Pipelines, Docker), and manage monitoring with Sentry and CloudWatch. These services handle high request volumes in production every month.
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Tech stack: PHP 8.x, Symfony, React, Next.js, PostgreSQL, MySQL, Docker, AWS (ECS, RDS, S3, SQS/SNS, CloudFront), Terraform, Supabase. I also use AI tools daily (Claude Code, Cursor) in my own workflow, so I understand both the strengths and the gaps in AI-generated code.
Based in Poland (CET timezone). Available for async work and calls during EU/US business hours.
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Get HelpFrequently Asked Questions
Can I increase the timeout limit?
Hobby: max 10s. Pro: max 60s. To exceed, use background jobs or external processing (e.g., Firebase Cloud Functions).
What should I do for long-running tasks?
Use Vercel Cron for scheduled jobs, or queue library like Bull/Inngest for async tasks that run outside request context.
How do I debug timeout issues?
Add console.log timestamps to find slow sections. Use Vercel Analytics to see function duration. Optimize the slowest part.