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Web Workers: Handling Heavy Processing on the Client Side

In this talk I will bring an overview how we handle with large process on Client Side (WebApp Applications) using Web Api called Web Worker. I'm going to bring a view of a use case that I had to apply web workers and the advantages it brought in heavy processing, called “Rinha Front end” on Brazil, an challenge where we had to process Json files of various sizes just using the client side and without affecting the user experience and blocking the use of the application.
So I this talk I will bring a simple case where using pure Javascript and how to use Web Workers to process out of the main thread and block our interactions with the page. We will create a simple application using vanilla JS and I will introduce you this feature.

This talk has been presented at JSNation US 2024, check out the latest edition of this JavaScript Conference.

FAQ

Kevin Wehara is a staff engineer at iFood, a Microsoft MVP, and a content tech creator on YouTube. He is also a Prochain Campinas organizer and a collaborator with NodeBR and GDG Campinas.

Kevin Wehara's talk focuses on web workers and handling large processing on the client side.

A Web Worker is an API provided by browsers that allows for operations, typically large calculations, to be executed off the main thread, ensuring the main thread is not blocked.

Web Workers are used to execute heavy processing tasks off the main thread, preventing UI blocking and improving application performance.

The main benefit of using Web Workers is that they allow for heavy processing to occur without blocking the main thread, which maintains the responsiveness of the UI.

Kevin Wehara demonstrates the use of Web Workers by creating two applications: one without Web Workers and one with Web Workers, and comparing their performance.

Kevin Wehara's article on Web Workers can be found on dev.io by searching for Kevin Wehara or introducing JavaScript WebWorkers.

Kevin Wehara uses an example where a large operation blocks the main thread, preventing other actions like changing the background color until the process is complete.

Kevin Wehara shares his tech content on YouTube and writes articles on dev.io.

Kevin Wehara works in the iFood Logistics Rival team, focusing on geoprocessing, geolocation, partner delivery areas, and delivery routes.

Kevin Uehara

18 min

21 Nov, 2024

Comments

Video Summary and Transcription

In this talk, the speaker introduces web workers and discusses how they can handle large processing on the client side. Examples, benchmarks, and tradeoffs are provided. The benefits of using web workers are discussed, and a demo project using VanillaJS and the live server extension of VS Code is showcased. The speaker demonstrates how to use web workers to prevent the main thread from getting blocked during large operations. The process of creating a web worker file and moving functions to it is explained. The speaker also shows how to handle messages and perform operations with web workers. The final remarks include contact information and an invitation to check out the speaker's YouTube channel for React courses and articles.

Available in Español: Web Workers: Manejo de Procesamiento Pesado en el Lado del Cliente

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