--- title: "Making Teleporting Smarter" url: https://daily.dev/posts/making-teleporting-smarter-q57czvhtl source_url: https://spidermonkey.dev/blog/2025/02/19/Making-Teleporting-Smarter.html type: article source: "SpiderMonkey" published: 2025-02-19T23:51:11.969Z updated: 2025-02-19T23:51:25.993Z tags: ["webdev", "javascript", "performance"] reading_time: 5 upvotes: 1 comments: 0 language: 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. # Making Teleporting Smarter **[SpiderMonkey](https://daily.dev/sources/spidermonkey)** · 5 min read · 1 upvotes · 0 comments ## Summary A recent patch improves JavaScript performance by addressing issues with property lookup optimizations when properties are shadowed or the prototype chain is mutated. This optimization, known as Shape Teleporting, ensures that inline caches remain efficient by reshaping objects in the prototype chain when necessary. The upgrade migrates object shapes to dictionary mode to avoid performance cliffs and the A-B-A problem. Micro-benchmarks confirm significant improvements, though broader performance testing shows minimal impact. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Don’t just attend KubeCon \+ CloudNativeCon, Merge Forward your experience\!](https://daily.dev/posts/don-t-just-attend-kubecon-cloudnativecon-merge-forward-your-experience--l0rpp73x8) · CNCF · 0 upvotes · 0 comments - [Announcing H2 2026 KCDs](https://daily.dev/posts/announcing-h2-2026-kcds-m96goajm1) · CNCF · 1 upvotes · 0 comments - [Two months of Open Community Groups](https://daily.dev/posts/two-months-of-open-community-groups-asf52zhbs) · CNCF · 0 upvotes · 0 comments --- Tags: [#webdev](https://daily.dev/tags/webdev), [#javascript](https://daily.dev/tags/javascript), [#performance](https://daily.dev/tags/performance) [View this post on daily.dev](https://daily.dev/posts/making-teleporting-smarter-q57czvhtl)