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# The two trees of React


- **Date:** Thursday, Jul 9, 2026
- **Time:** 17:30–18:00 (30 min)
- **Room:** Stage 11
- **Event:** World Congress 2026 Europe

## Recording

[Watch recording](https://www.wearedevelopers.com/videos/100180-the-two-trees-of-react)

## Description

React encourages thinking about your UI as a tree. But there are two different trees that matter for understanding re-renders, and confusing them leads to performance problems and wasted effort. This session introduces a mental model that helps you understand the performance impact of composition and busts the React Context performance myth.

## Speaker

### [Carl Assmann](https://www.wearedevelopers.com/@carl-assmann)

Product Engineer at SynTwin


## Related talks at this congress

- [Exploring Server Side Rendering](https://www.wearedevelopers.com/events/world-congress-2026-europe/sessions/1238-exploring-server) — Krasimir Tsonev
- [Prompt, Render, Debug: AI-Powered React Development with Chrome DevTools](https://www.wearedevelopers.com/events/world-congress-2026-europe/sessions/1222-prompt-render-debug) — Suchitra Swain
- [3x Performance: A Humbling Journey](https://www.wearedevelopers.com/events/world-congress-2026-europe/sessions/1166-3x-performance-a) — Luca Trușcă
- [JSX to Live Activity: The Story of Voltra](https://www.wearedevelopers.com/events/world-congress-2026-europe/sessions/1120-jsx-to-live-activity) — Szymon Chmal