When load times are slow, screens lag, or orders take too long to process, users leave—and they leave reviews. In this webinar, Callstack’s engineering and business experts, Adam Trzciński, Eduardo Graciano, Łukasz Chludziński, and Krzysztof Pawlak, walk you through a real case study of a healthcare e-commerce app struggling with user churn, poor ratings, and low retention due to performance issues.

You’ll learn how a targeted React Native performance audit led to measurable improvements, such as reducing startup time by half, cutting app size by 10 MB, and increasing user ratings from 3.8 to 4.5.

What you’ll learn about real-world performance and how to improve it

Whether your team is planning a performance audit or you’re already tracking issues like dropped frames or slow time-to-interactive, this webinar gives you the tools and thinking to drive real results.

Key metrics that reveal how your app performs in the wild

• What FPS (frames per second), TTI (time to interactive), and memory usage really tell you.
• How app size and load time affect retention, especially on low-end devices.
• Why slow interactions hurt trust and conversion, and how to measure it.

Practical techniques to speed up React Native apps

• When to use FlashList, and how to avoid common rendering issues.
• How to manage state and networking to avoid unnecessary re-renders.
• Lazy loading, GraphQL, and modular design for faster startup and navigation.
• Tools like Flipper, Reassure, and system profilers for accurate measurement.

Inside a real case study: What changed and why it worked

• The ins and outs of improving app performance for 2 companies: Dream 11, a fantasy sports platform from India, and one of the world's largest sports betting and gaming entertainment groups from the United Kingdom.
• What implementation steps made the biggest difference.
• How these changes improved conversion, retention, and user satisfaction.

Watch the recording now to learn how React Native optimization can help your team deliver faster, better apps.