--- title: Wilson Lin on FastRender: a browser built by thousands... description: FastRender is a web browser rendering engine built from scratch using thousands of parallel AI coding agents coordinated by Cursor. Started as a personal... canonical: https://daily.dev/posts/wilson-lin-on-fastrender-a-browser-built-by-thousands-of-parallel-agents-masogaxc9 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Wilson Lin on FastRender: a browser built by thousands of parallel agents | daily.dev og:description: FastRender is a web browser rendering engine built from scratch using thousands of parallel AI coding agents coordinated by Cursor. Started as a personal... og:url: https://daily.dev/posts/wilson-lin-on-fastrender-a-browser-built-by-thousands-of-parallel-agents-masogaxc9 og:image: https://api.daily.dev/og/posts/MaSOGAXc9.png og:image:alt: Wilson Lin on FastRender: a browser built by thousands of parallel agents og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Wilson Lin on FastRender: a browser built by thousands of parallel agents **[Simon Willison](https://daily.dev/sources/simonwillison)** · 11 min read · 1 upvotes · 0 comments ## Summary FastRender is a web browser rendering engine built from scratch using thousands of parallel AI coding agents coordinated by Cursor. Started as a personal experiment in November, the project ran up to 2,000 agents concurrently, generating nearly 30,000 commits over three weeks. The agents worked autonomously for up to a week at a time, organized in tree structures with planning agents dividing work and worker agents executing tasks. Key insights include: agents successfully minimized merge conflicts through effective task division, GPT-5.1/5.2 outperformed specialized coding models for autonomous operation, and allowing temporary compilation errors proved beneficial for throughput. The project demonstrates what a single engineer can achieve with agent swarms in 2026, producing over a million lines of Rust code capable of rendering real web pages. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Scaling long-running autonomous coding](https://daily.dev/posts/scaling-long-running-autonomous-coding-j1ucc2ohl) · Cursor · 1 upvotes · 0 comments - [One Human \+ One Agent = One Browser From Scratch](https://daily.dev/posts/one-human-one-agent-one-browser-from-scratch-avhv6ry0n) · Hacker News · 1 upvotes · 1 comments --- Tags: [#llm](https://daily.dev/tags/llm), [#rust](https://daily.dev/tags/rust) [View this post on daily.dev](https://daily.dev/posts/wilson-lin-on-fastrender-a-browser-built-by-thousands-of-parallel-agents-masogaxc9) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Wilson Lin on FastRender: a browser built by thousands of parallel agents","url":"https://daily.dev/posts/wilson-lin-on-fastrender-a-browser-built-by-thousands-of-parallel-agents-masogaxc9","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/wilson-lin-on-fastrender-a-browser-built-by-thousands-of-parallel-agents-masogaxc9"},"datePublished":"2026-01-23T21:31:27.726Z","dateModified":"2026-01-23T21:32:17.846Z","description":"FastRender is a web browser rendering engine built from scratch using thousands of parallel AI coding agents coordinated by Cursor. 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