--- title: JavaScript optimisation with LLMs is too good to ignore now description: Using LLMs to optimize JavaScript performance has proven highly effective across 20+ real-world scenarios, reducing turnaround time from hours or days to... canonical: https://daily.dev/posts/javascript-optimisation-with-llms-is-too-good-to-ignore-now-nttz4o4xb twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: JavaScript optimisation with LLMs is too good to ignore now | daily.dev og:description: Using LLMs to optimize JavaScript performance has proven highly effective across 20+ real-world scenarios, reducing turnaround time from hours or days to... og:url: https://daily.dev/posts/javascript-optimisation-with-llms-is-too-good-to-ignore-now-nttz4o4xb og:image: https://api.daily.dev/og/posts/NttZ4o4xB.png og:image:alt: JavaScript optimisation with LLMs is too good to ignore now 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. # JavaScript optimisation with LLMs is too good to ignore now **[Joshua Morony](https://daily.dev/sources/joshuamorony)** · 11 min read · 55 upvotes · 5 comments ## Summary Using LLMs to optimize JavaScript performance has proven highly effective across 20+ real-world scenarios, reducing turnaround time from hours or days to minutes. The approach involves profiling with DevTools to identify bottlenecks, then having AI analyze and fix the code. Results include transforming a game from 20-30 FPS to near 60 FPS even with 4x CPU slowdown. LLMs successfully handled everything from simple closure optimizations to advanced techniques like baking tile maps into static textures and implementing complex bit-shifting algorithms. While some knowledge transfer is sacrificed, the speed and reliability of AI-driven solutions make them practical for shipping projects without accumulating technical debt. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@byteoutlaw** · 0 upvotes > Amen, I really feel this now, when I start to have a codebase! :) **@lc999123** · 0 upvotes > This balance you talked about is something I am also trying to navigate in my own development process. How much should I struggle to make knowledge sticky, and is it worth it? The advance "bit shifting" techniques you talked about were skill sets that separated okay devs and rock star devs. If AI are handling the rock star dev part then what will happen to developers in the future? > > Just thinking about this is giving me existential dread. **@baz14** · 0 upvotes > Unfortunately, AI isn't the only culprit. > > JavaScript is full of unnecessary code. > > Easy to get started = easy to write junk code. ## Similar posts on daily.dev - [WebGPU Browser AI: Run LLMs Client-Side, No Backend](https://daily.dev/posts/webgpu-browser-ai-run-llms-client-side-no-backend-1evlxlfvf) · SitePoint · 0 upvotes · 0 comments - [LLMs and performative productivity](https://daily.dev/posts/llms-and-performative-productivity-yvgqj9ifi) · Lobsters · 0 upvotes · 0 comments - [Map LLM Tools to Optimize Your AI Workflow Efficiently](https://daily.dev/posts/map-llm-tools-to-optimize-your-ai-workflow-efficiently-no8c12hug) · PromptLayer Blog · 0 upvotes · 0 comments --- Tags: [#game-development](https://daily.dev/tags/game-development), [#javascript](https://daily.dev/tags/javascript), [#llm](https://daily.dev/tags/llm), [#performance](https://daily.dev/tags/performance), [#webdev](https://daily.dev/tags/webdev), [#webgl](https://daily.dev/tags/webgl) [View this post on daily.dev](https://daily.dev/posts/javascript-optimisation-with-llms-is-too-good-to-ignore-now-nttz4o4xb) ```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":"JavaScript optimisation with LLMs is too good to ignore now","url":"https://daily.dev/posts/javascript-optimisation-with-llms-is-too-good-to-ignore-now-nttz4o4xb","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/javascript-optimisation-with-llms-is-too-good-to-ignore-now-nttz4o4xb"},"datePublished":"2026-01-22T11:23:51.711Z","dateModified":"2026-10-14T02:23:57.431Z","description":"Using LLMs to optimize JavaScript performance has proven highly effective across 20+ real-world scenarios, reducing turnaround time from hours or days to...","image":"https://i.ytimg.com/vi/qeZQNHp8XWE/sddefault.jpg","thumbnailUrl":"https://i.ytimg.com/vi/qeZQNHp8XWE/sddefault.jpg","isAccessibleForFree":true,"articleSection":"Joshua Morony","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Joshua Morony","logo":"https://media.daily.dev/image/upload/s--t70g7cwc--/f_auto/v1724339016/logos/joshuamorony","url":"https://daily.dev/sources/joshuamorony"},"commentCount":5,"discussionUrl":"https://daily.dev/posts/javascript-optimisation-with-llms-is-too-good-to-ignore-now-nttz4o4xb","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":55},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":5}],"keywords":"game-development,javascript,llm,performance,webdev,webgl","timeRequired":"PT11M","video":{"@type":"VideoObject","name":"JavaScript optimisation with LLMs is too good to ignore now","description":"Using LLMs to optimize JavaScript performance has proven highly effective across 20+ real-world scenarios, reducing turnaround time from hours or days to...","thumbnailUrl":"https://i.ytimg.com/vi/qeZQNHp8XWE/sddefault.jpg","uploadDate":"2026-01-22T11:23:51.711Z","duration":"PT11M","url":"https://api.daily.dev/r/NttZ4o4xB","embedUrl":"https://www.youtube.com/embed/qeZQNHp8XWE"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Joshua Morony","item":"https://daily.dev/sources/joshuamorony"},{"@type":"ListItem","position":3,"name":"JavaScript optimisation with LLMs is too good to ignore now"}]} {"@context":"https://schema.org","@type":"WebPage","@id":"https://daily.dev/posts/javascript-optimisation-with-llms-is-too-good-to-ignore-now-nttz4o4xb","comment":[{"@type":"Comment","text":"Amen, I really feel this now, when I start to have a codebase! :)","datePublished":"2026-01-23T19:00:30.930Z","url":"https://daily.dev/posts/NttZ4o4xB#c-qsVB6w66d","author":{"@type":"Person","name":"Jacob B. Bonde","url":"https://daily.dev/byteoutlaw","image":"https://media.daily.dev/image/upload/s--veTChHK7--/f_auto/v1733220070/avatars/avatar_5cQvIZKr5tDFDotVDjulg"}},{"@type":"Comment","text":"This balance you talked about is something I am also trying to navigate in my own development process. How much should I struggle to make knowledge sticky, and is it worth it? The advance “bit shifting” techniques you talked about were skill sets that separated okay devs and rock star devs. If AI are handling the rock star dev part then what will happen to developers in the future?\nJust thinking about this is giving me existential dread.","datePublished":"2026-02-02T14:33:04.749Z","url":"https://daily.dev/posts/NttZ4o4xB#c-WX3G1suGC","author":{"@type":"Person","name":"LC","url":"https://daily.dev/lc999123"}},{"@type":"Comment","text":"Unfortunately, AI isn’t the only culprit.\nJavaScript is full of unnecessary code.\nEasy to get started = easy to write junk code.","datePublished":"2026-02-18T04:12:13.942Z","url":"https://daily.dev/posts/NttZ4o4xB#c-OYZaNKp5H","author":{"@type":"Person","name":"Baz","url":"https://daily.dev/baz14","image":"https://lh3.googleusercontent.com/a/ACg8ocKd2iFU8YS4sV-rBJptuYSF8EHeQnm23N_dcXE1uON7_GMIlZg=s96-c"}}]} ```