--- title: "React Native FastIO: Nitro-Powered Performance Boost" description: "Listen to Mike Grabowski talk about React Native FastIO, a collection of primitives for working with data in React Native and its performance benefits." url: https://www.callstack.com/podcasts/react-native-fastio updated: 2026-10-24T08:39:43.442Z --- # React Native FastIO: Nitro-Powered Performance Boost Listen to Mike Grabowski talk about React Native FastIO, a collection of primitives for working with data in React Native and its performance benefits. _Guest: Mike Grabowski, CEO & Founder @ Callstack · Host: Jakub Urban, Software Engineer @ Callstack · Published 2024-12-18 · Duration 45:28 · Category: Performance_ Listen: [YouTube](https://youtu.be/u4PBBLujv7I) · [Spotify](https://open.spotify.com/episode/6iXsh9MLpDeGmqKndp0hiT) · [Apple Podcasts](https://podcasts.apple.com/us/podcast/react-native-fastio-nitro-powered-performance-boost/id1525543072?i=1000680821991) · [SoundCloud](https://soundcloud.com/user-985069846/react-native-fastio-nitro-powered-performance-boost-react-universe-on-air-coffee-talk-25/s-CknkBL3urjP) After almost two years, Mike Grabowski, the first host of Callstack’s podcast, is back. In this Coffee Talk, however, he’s joining Kuba as a guest. The two are discussing the recently released React Native FastIO - a library designed to boost I/O operations inside React Native applications. What started out as an experiment of using Nitro Modules to build something incredibly fast and efficient, Mike’s work has led to the creation of a library that offers a variety of I/O primitives, including blob, fetch, file system, and streams. React Native FastIO aims to provide developers with powerful, native-like capabilities while maintaining web compliance, setting a new standard for handling complex I/O tasks in React Native. ## Blazing fast I/O for React Native built on top of Nitro - The evolution of FastIO from a simple Web Socket module to a comprehensive library with various I/O primitives, - Detailed explanation of the I/O primitives included in React Native FastIO, such as blob, fetch, file system, and streams, - Architectural approach, focusing on modularity and separation between front-end and back-end processes, - Challenges faced during the development process, - Significance of web compliance in React Native FastIO and its impact on cross-platform development, - Use cases for React Native FastIO, highlighting scenarios where you can make the most of the library, e.g., in resource-heavy applications and real-time data handling, - Future roadmap, including potential expansions and improvements. ## More about React Native FastIO - [React Native FastIO on GitHub](https://github.com/callstackincubator/react-native-fast-io) - Mike Grabowski on [X](https://x.com/grabbou) and [BlueSky](https://bsky.app/profile/grabbou.com) Insights ## Learn more about Performance Here's everything we published recently on this topic. [View all](https://www.callstack.com/insights) - [Why Nitro Is More Than a Faster Bridge](https://www.callstack.com/podcasts/why-nitro-is-more-than-a-faster-bridge) (Jul 3 · Podcast): Marc Rousavy (Margelo) talks Nitro modules, native state, zero-copy data, Vision Camera, and why speed is only part of the story. - [Profile React Components in React Native Release Builds](https://www.callstack.com/blog/profile-react-components-in-react-native-release-builds) (May 25 · Article): 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. - [Memory Ownership Models: When JavaScript Meets Native Code](https://www.callstack.com/blog/memory-ownership-models-when-javascript-meets-native-code) (Nov 21 · Article): 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. - [From Files to Buffers: Building Real-Time Audio Pipelines in React Native](https://www.callstack.com/blog/from-files-to-buffers-building-real-time-audio-pipelines-in-react-native) (Oct 14 · Article): 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. - [How to Add Custom JSI Bindings in Your TurboModule (and Why You Might Need Them)](https://www.callstack.com/blog/how-to-add-custom-jsi-bindings-in-your-turbomodule-and-why-you-might-need-them) (Sep 8 · Article): 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. - [Exploring Fibers: Cooperative Multitasking and Lock-Free Task Execution](https://www.callstack.com/blog/exploring-fibers-cooperative-multitasking-and-lock-free-task-execution) (Jul 24 · Article): 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. - [Multithreading Isn’t Free: Performance Pitfalls Visualized](https://www.callstack.com/blog/multithreading-isnt-free-performance-pitfalls-visualized) (May 21 · Article): 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. - [Master JavaScript Performance in React Native (Part 2)](https://www.callstack.com/events/master-javascript-performance-in-react-native-part-2) (Apr 28 · Webinar): Learn to fix JS performance issues in React Native-from debounce bugs to Redux selectors, in this hands-on webinar with real code examples. - [Tips & Tricks From The Ultimate Guide to React Native Optimization 2025](https://www.callstack.com/events/tips-tricks-from-the-ultimate-guide-to-react-native-optimization-2025) (Apr 24 · Talk): View flattening, React 19 hooks, real DevTools tips-learn what actually helps your React Native app run faster.