Optimizing Performance in Large-Scale React & Node.js Applications - DevConf.CZ 2025

Speaker(s): Tejas Gavankar, Hrithik Gavankar

Did you know that 47% of users expect a webpage to load in under 2 seconds, and a 1-second delay can reduce conversions by 7%? In large-scale applications, ensuring fast API responses and a smooth frontend experience isn’t just a luxury—it’s a necessity. Yet, as applications grow, memory leaks, inefficient data handling, and unoptimized rendering can cripple performance.

This talk dives deep into real-world performance challenges faced in high-traffic React & Node.js applications, such as those powering live sports platforms. We’ll explore techniques for reducing API response times, mitigating memory leaks in server-side JavaScript, and optimizing frontend rendering with AG Grid for handling vast datasets. Through real-world debugging examples and Chrome DevTools insights, attendees will gain actionable strategies to improve speed, scalability, and efficiency in their applications.

Key Takeaways:
Reducing API Latency – Optimizing database queries, caching strategies, and async processing for faster Node.js responses.
Memory Leak Detection & Prevention – Using Chrome DevTools to identify and fix memory issues in React & Node.js.
Frontend Performance Optimization – Improving UI responsiveness when handling large datasets with AG Grid and virtualization.
Best Practices for Scaling Applications – Balancing state management, network requests, and UI rendering for smooth user experiences.
By the end of this session, developers will walk away with proven techniques to build high-performing, scalable applications while avoiding common pitfalls in React & Node.js.
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Full schedule, including slides and other resources:
https://pretalx.devconf.info/devconf-cz-2025/schedule/

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