--- title: RollerCoaster Tycoon Optimizations are Insane | daily.dev description: A breakdown of three key optimizations used in RollerCoaster Tycoon (1999), written entirely in x86 assembly by Chris Sawyer. The optimizations covered are:... canonical: https://daily.dev/posts/rollercoaster-tycoon-optimizations-are-insane-fkbefw0uv twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: RollerCoaster Tycoon Optimizations are Insane | daily.dev og:description: A breakdown of three key optimizations used in RollerCoaster Tycoon (1999), written entirely in x86 assembly by Chris Sawyer. The optimizations covered are:... og:url: https://daily.dev/posts/rollercoaster-tycoon-optimizations-are-insane-fkbefw0uv og:image: https://api.daily.dev/og/posts/fKBEfw0UV.png og:image:alt: RollerCoaster Tycoon Optimizations are Insane 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. # RollerCoaster Tycoon Optimizations are Insane **[ThePrimeTime](https://daily.dev/sources/primeagen)** · 9 min read · 2 upvotes · 0 comments ## Summary A breakdown of three key optimizations used in RollerCoaster Tycoon (1999), written entirely in x86 assembly by Chris Sawyer. The optimizations covered are: (1) minimizing memory per NPC by using 1-2 bytes for money representation to fit within the 16MB RAM constraint; (2) replacing multiplications and divisions with bit shifts to save CPU cycles on 90MHz processors; and (3) avoiding expensive pathfinding (Dijkstra's algorithm) for most agents — instead using random wandering, with limited-depth pathfinding only for mechanics and guests trying to exit. A fun detail: buying a map in-game increased a guest's pathfinding search depth from 5 to 7, helping them find exits rather than rides. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [The gold standard of optimization: A look under the hood of RollerCoaster Tycoon](https://daily.dev/posts/the-gold-standard-of-optimization-a-look-under-the-hood-of-rollercoaster-tycoon-8y0n9kaq6) · Hacker News · 0 upvotes · 0 comments - [Interview with RollerCoaster Tycoon’s Creator, Chris Sawyer](https://daily.dev/posts/interview-with-rollercoaster-tycoon-s-creator-chris-sawyer-v5kqliwoh) · Hacker News · 0 upvotes · 0 comments - [How Pizza Tycoon simulated traffic on a 25 MHz CPU — Pizza Legacy Blog](https://daily.dev/posts/how-pizza-tycoon-simulated-traffic-on-a-25-mhz-cpu-pizza-legacy-blog-urptbdzaa) · Lobsters · 0 upvotes · 0 comments - [How Pizza Tycoon Simulates Traffic On A 25 MHz CPU](https://daily.dev/posts/how-pizza-tycoon-simulates-traffic-on-a-25-mhz-cpu-jy9yjitdg) · Hackaday · 0 upvotes · 0 comments --- Tags: [#performance](https://daily.dev/tags/performance), [#assembly](https://daily.dev/tags/assembly) [View this post on daily.dev](https://daily.dev/posts/rollercoaster-tycoon-optimizations-are-insane-fkbefw0uv) ```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":"RollerCoaster Tycoon Optimizations are Insane","url":"https://daily.dev/posts/rollercoaster-tycoon-optimizations-are-insane-fkbefw0uv","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/rollercoaster-tycoon-optimizations-are-insane-fkbefw0uv"},"datePublished":"2026-04-24T12:11:49.190Z","dateModified":"2026-04-24T12:12:13.923Z","description":"A breakdown of three key optimizations used in RollerCoaster Tycoon (1999), written entirely in x86 assembly by Chris Sawyer. The optimizations covered are:...","image":"https://i.ytimg.com/vi/ZANFhJ9HYsM/sddefault.jpg","thumbnailUrl":"https://i.ytimg.com/vi/ZANFhJ9HYsM/sddefault.jpg","isAccessibleForFree":true,"articleSection":"ThePrimeTime","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":"ThePrimeTime","logo":"https://media.daily.dev/image/upload/s--J5-GjDeo--/f_auto/v1704628081/logos/primeagen.jpg","url":"https://daily.dev/sources/primeagen"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/rollercoaster-tycoon-optimizations-are-insane-fkbefw0uv","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"performance,assembly","timeRequired":"PT9M","video":{"@type":"VideoObject","name":"RollerCoaster Tycoon Optimizations are Insane","description":"A breakdown of three key optimizations used in RollerCoaster Tycoon (1999), written entirely in x86 assembly by Chris Sawyer. The optimizations covered are:...","thumbnailUrl":"https://i.ytimg.com/vi/ZANFhJ9HYsM/sddefault.jpg","uploadDate":"2026-04-24T12:11:49.190Z","duration":"PT9M","url":"https://api.daily.dev/r/fKBEfw0UV","embedUrl":"https://www.youtube.com/embed/ZANFhJ9HYsM"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"ThePrimeTime","item":"https://daily.dev/sources/primeagen"},{"@type":"ListItem","position":3,"name":"RollerCoaster Tycoon Optimizations are Insane"}]} ```