--- title: Designing a custom lazy list in SwiftUI with better... description: SwiftUI's built-in List and LazyHStack struggle with large datasets on macOS. This tutorial walks through building a custom lazy scrolling list that... canonical: https://daily.dev/posts/designing-a-custom-lazy-list-in-swiftui-with-better-performance-u42igjnao twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Designing a custom lazy list in SwiftUI with better performance | daily.dev og:description: SwiftUI's built-in List and LazyHStack struggle with large datasets on macOS. This tutorial walks through building a custom lazy scrolling list that... og:url: https://daily.dev/posts/designing-a-custom-lazy-list-in-swiftui-with-better-performance-u42igjnao og:image: https://api.daily.dev/og/posts/u42IGjNaO.png og:image:alt: Designing a custom lazy list in SwiftUI with better performance 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. # Designing a custom lazy list in SwiftUI with better performance **[Nil Coalescing](https://daily.dev/sources/nilcoalescing)** · 8 min read · 0 upvotes · 0 comments ## Summary SwiftUI's built-in List and LazyHStack struggle with large datasets on macOS. This tutorial walks through building a custom lazy scrolling list that aggressively recycles a fixed pool of view identities using fragment IDs (row index modulo visible row count), a custom Layout implementation (OffsetLayout) for precise row positioning, and the onScrollGeometryChange modifier to track visible rows. The approach mirrors NSTableView-style cell reuse, significantly reducing memory usage and improving scroll performance. A caveat about local @State persistence across recycled rows is also addressed. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Taming Row Height and Spacing Jumps in SwiftUI List with a Custom Layout](https://daily.dev/posts/taming-row-height-and-spacing-jumps-in-swiftui-list-with-a-custom-layout-kjhlldkzi) · Fatbobman · 0 upvotes · 0 comments - [Mastering SwiftUI Tables: Best Practices for Handling Big Data in iOS](https://daily.dev/posts/mastering-swiftui-tables-best-practices-for-handling-big-data-in-ios-5gqnrizeh) · Medium · 0 upvotes · 0 comments - [Building List replacement in SwiftUI](https://daily.dev/posts/building-list-replacement-in-swiftui-vxostfian) · Swift with Majid · 0 upvotes · 0 comments --- Tags: [#performance](https://daily.dev/tags/performance), [#ios](https://daily.dev/tags/ios), [#swiftui](https://daily.dev/tags/swiftui) [View this post on daily.dev](https://daily.dev/posts/designing-a-custom-lazy-list-in-swiftui-with-better-performance-u42igjnao) ```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":"Designing a custom lazy list in SwiftUI with better performance","url":"https://daily.dev/posts/designing-a-custom-lazy-list-in-swiftui-with-better-performance-u42igjnao","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/designing-a-custom-lazy-list-in-swiftui-with-better-performance-u42igjnao"},"datePublished":"2026-08-02T07:15:14.414Z","dateModified":"2026-08-02T07:35:54.529Z","description":"SwiftUI's built-in List and LazyHStack struggle with large datasets on macOS. 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