Memory Leak After Cursor Refactored Cleanup Code
Your application has developed a memory leak after Cursor refactored cleanup code. Memory usage increases over time and never decreases, eventually causing crashes or slowdowns.
Event listeners or subscriptions are not being properly cleaned up.
Error Messages You Might See
Common Causes
- useEffect cleanup function removed or broken
- Event listener added but never removed (addEventListener without removeEventListener)
- Subscription created but not unsubscribed (Observable)
- Timers (setInterval/setTimeout) not cleared
- References held to DOM nodes preventing garbage collection
How to Fix It
useEffect cleanup returns function: useEffect(() => { return () => cleanup; }, []). Remove listeners: window.removeEventListener('scroll', handler). Clear timers: clearInterval(id). Unsubscribe: subscription.unsubscribe(). Use Chrome DevTools Memory tab to detect leaks.
Real developers can help you.
MFox
Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking.
Kingsley Omage
Fullstack software engineer passionate about AI Agents, blockchain, LLMs.
Jaime Orts-Caroff
I'm a Senior Android developer, currently working at Aircall. I'm open to work in various fields!
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.
Matthew Butler
Systems Development Engineer @ Amazon Web Services
Costea Adrian
Embedded Engineer specilizing in perception systems. Latest project was a adas camera calibration system.
Richard McSorley
Full-Stack Software Engineer with 8+ years building high-performance applications for enterprise clients. Shipped production systems at Walmart (4,000+ stores), Cigna (20M+ users), and Arkansas Blue Cross. 5 patents in retail/supply chain tech. Currently focused on AI integrations, automation tools, and TypeScript-first architectures.
Luca Liberati
I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
rayush33
JavaScript (React.js, React Native, Node.js) Developer with demonstrated industry experience of 4+ years, actively looking for opportunities to hone my skills as well as help small-scale business owners with solutions to technical problems
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.
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 do I detect memory leaks?
Chrome DevTools Memory tab. Take heap snapshots. Compare before/after action. Look for growing detached DOM nodes.
What's a WeakMap?
Map that holds weak references. Allows garbage collection if key is no longer referenced elsewhere. Useful for metadata on objects.