React documentation (opens in a new tab)
The official reference for the tools used in this lesson.
Link
Lazy loading and prefetching
Lazy loading defers the download; prefetching starts it early on a hint like hover. Together they hide the network cost from the user.
Lesson 4.222m 50sAdvanced3.6k students
Lesson length
22:50What this lesson covers
- Load a component only when it is about to be needed
- Prefetch on intent signals such as hover or viewport
- Keep a fallback that does not shift the layout
This lesson sits in Bundle and Load Performance, part of React Performance Engineering. It assumes what came before it and leads directly into the next lesson in the module.
In this lesson you will
- Load a component only when it is about to be needed
- Prefetch on intent signals such as hover or viewport
- Keep a fallback that does not shift the layout
Resources
Personal notes are coming soon.