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# Multithreading in Javascript: A guide to Web Workers


- **Date:** Friday, Jul 11, 2025
- **Time:** 09:40–10:10 (30 min)
- **Room:** Stage 9
- **Event:** World Congress 2025
- **Tags:** frontend, javascript, performance

## Recording

[Watch recording](https://www.wearedevelopers.com/videos/1673-multithreading-in-javascript-a-guide-to-web-workers)

## Description

Javascript as a single threaded language is unable to maximise the full potential of our CPUs, but there might be a solution: Web Workers.

Not without understanding all the concepts around the Javascript engine first (call stack, event loop, micro tasks, macro tasks, asynchronous functions...)  let's find a project in which multithreading could be suitable and dive into a demonstration on how to convert the single threaded code into multithreaded.

Are Web Workers the performance solution you need for you application? Do they have any downside or everything is clear and shiny? Let's find it out

## Speaker

### [Dani Coll](https://www.wearedevelopers.com/@dani-coll)

Senior Frontend Engineer at Dynatrace


## Related talks at this congress

- [Node.js: More Threads Than You Think](https://www.wearedevelopers.com/events/world-congress-2025/sessions/644-node-js-more-threads) — Matteo Collina
- [Multithreaded Node.js](https://www.wearedevelopers.com/events/world-congress-2025/sessions/731-multithreaded-node) — Matteo Collina
- [Advanced Micro Frontends: Multi-Version and Multi-Framework Scenarios](https://www.wearedevelopers.com/events/world-congress-2025/sessions/501-advanced-micro) — Manfred Steyer
- [The Journey of a Pixel in a React Application](https://www.wearedevelopers.com/events/world-congress-2025/sessions/890-the-journey-of-a) — Shem Magnezi