Insights

Performance

Performance optimization is crucial for delivering a smooth, responsive experience in React Native applications. Explore techniques for improving startup time, reducing bundle size, optimizing renders, and handling memory efficiently to create applications that delight users across all devices.

Agentic DeliverySoftware Development

Building an Agentic SDLC for a Web Launch in Under One Month

3x
estimated delivery acceleration
Podcast Cover
podcast
7/3/2026

Why Nitro Is More Than a Faster Bridge

Marc Rousavy (Margelo) talks Nitro modules, native state, zero-copy data, Vision Camera, and why speed is only part of the story.
Article Cover
Article
5/25/2026

Profile React Components in React Native Release Builds

Learn how to profile React components in React Native release builds with @callstack/inspector, using an Expo app setup that requires zero native code changes.
Article Cover
Article
11/21/2025

Memory Ownership Models: When JavaScript Meets Native Code

A deep dive into how React Native handles memory when JavaScript and native code share ArrayBuffer data. Learn why async processing can break, how GC affects raw pointers, and the safe patterns for building high-performance native integrations.
Article Cover
Article
10/14/2025

From Files to Buffers: Building Real-Time Audio Pipelines in React Native

Learn how to move beyond file-based audio APIs and work directly with in-memory PCM data in React Native. This guide shows how to construct WAV buffers, use JSI for zero-copy transfers, and enable real-time audio processing.
Article Cover
Article
9/8/2025

How to Add Custom JSI Bindings in Your TurboModule (and Why You Might Need Them)

TurboModules provide a type-safe way to write native code in React Native. JSI sits underneath as a lower-level API, enabling direct interaction with the JavaScript runtime. Beyond what TurboModules expose, JSI gives you access to powerful features, such as working directly with ArrayBuffers. This article shows how to inject a custom binding step by step.
Article Cover
Article
7/24/2025

Exploring Fibers: Cooperative Multitasking and Lock-Free Task Execution

Explore how fibers enable lightweight, cooperative multitasking. This guide walks through building a simple scheduler, managing task dependencies without locks, and using Tracy to visualize performance.
Article Cover
Article
5/21/2025

Multithreading Isn’t Free: Performance Pitfalls Visualized

Learn how to profile and optimize multithreaded apps. Discover why more threads don’t always mean faster results and how bad thread contention really is.
Events Cover
Webinar
4/28/2025

Master JavaScript Performance in React Native (Part 2)

Learn to fix JS performance issues in React Native-from debounce bugs to Redux selectors, in this hands-on webinar with real code examples.
Events Cover
Event
4/24/2025

Tips & Tricks From The Ultimate Guide to React Native Optimization 2025

View flattening, React 19 hooks, real DevTools tips-learn what actually helps your React Native app run faster.
Events Cover
Event
4/24/2025

User-Focused Performance Tracking

Discover how Expensify defines and tracks performance metrics that actually impact user experience.
Events Cover
Webinar
4/15/2025

Master JavaScript Performance in React Native (Part 1)

Watch Callstack's webinar on React Native JS performance. Learn to fix bottlenecks, leaks & FPS issues from the 2025 Ultimate Guide authors.
Hire us

Need to boost your app’s performance?

We help React Native teams enhance speed, responsiveness, and efficiency.

Talk to our team

We’ll connect you with the right expert within 24 hours.

Talk to our team

By submitting, you agree to be contacted about your request.
Learn more in our Privacy Policy.