Author

Tomasz J. Żelawski

Writes about

React Native

ArticlesLatest from Tomasz

React Native

The Memory Hermes Can't See: Stale Shadow Nodes in React Native

Background I spent the last few weeks measuring different apps and configurations to find out exactly how Bundle Mode impacts the performance of React Native a...

Tomasz J. Żelawski•

Aug 5, 2026•5 min read

React Native

How Worklets Bundle Mode accidentally fixed Hermes V1 memory regression

TL;DR Some apps using Reanimated and Worklets started using a lot more memory after switching to Hermes V1. The cause turned out to be in Hermes itself: it qui...

Tomasz J. Żelawski•

Jul 21, 2026•6 min read

React Native

Worklets 0.8: The Shareable — Shared Memory’s Missing Piece

TL;DR: Worklets 0.8.0 introduces the Shareable — a runtime bound shared memory primitive that powers Reanimated’s Shared Values under the hood. Now it’s availa...

Tomasz J. Żelawski•

Mar 19, 2026•4 min read

Exploded smartphone illustration with separated internal layers

React Native

Behind the Scenes of React Native Multithreading: Vision Camera V5 x React Native Worklets

If you’ve been working with React Native for a while, you’ve probably hit a wall where animations, gestures, or app performance should have been smooth, but we...

Tomasz J. Żelawski•

Jan 29, 2026•5 min read