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A look into debugging a performance issue in Jetsnack and how to fix it in Compose. Learn why deferring state reads by using a lambda means composition can be skipped.  

## Key points

- The three phases of Compose are composition, layout, and draw.
- Compose can skip a phase if nothing has changed. Sometimes Compose will entirely skip composition to optimize performance.
- You can use a lambda modifier can skip composition.
- Skipping recomposition can help reduce jank during scrolling.
- The Layout Inspector in Android Studio is a good tool to help you debug recomposition issues.

## Resources

- [Blog post](https://goo.gle/3TRm8wv)
- [Jetsnack on GitHub](https://goo.gle/3D3NCJl)

## Collections that contain this guide

This guide is part of these curated Quick Guide collections that cover broader Android development goals:  
![](https://developer.android.com/static/images/quick-guides/collection-illustration.png)  
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### Compose basics

This series of videos introduces various Compose APIs, quickly showing you what's available and how to use them.  
[Quick guide collection](https://developer.android.com/develop/ui/compose/quick-guides/collections/compose-basics)
![](https://developer.android.com/static/images/picto-icons/help.svg)  

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