Next.js 16.3 Turbopack Chunking: Instant Navigations Are Useless If the Wrong Chunks Ship
Instant Navigations don't help if the browser still downloads the wrong JavaScript. Here's what a Turbopack chunk actually is, the official nextjs.org numbers, the 16.3 knobs, and the order I'd roll this onto my Sanity + App Router portfolio.
T
Muhammad Tayyab
September 4, 2026·14 min read