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Devon Bernard: Lean React - Patterns for High-Performance

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Talk by Devon Bernard at the Plone Conference 2017 in Barcelona.

Get a normalised state for your json data. Think about how to structure your data so you don't duplicate data, and you have quick retrieval. For example use the normalizr library.

Use Redux development tools to give you hints or boiler plate for a new test.

Use components. When you use them, make sure they don't block other components: if four other components are not getting shown until a fifth one is ready, that is not a good idea. Give the user the information that is already there. Already show a skeleton on the page of how the component is going to look, so you only need to fill in some extra stuff and the user can already see how the component will look like.

Watch the component life cycle: which part is taking the most time?

Check if repainting is really needed before you do it: maybe a data value gets set but it is the same as the old value. Catch this and save on rendering. Use the Chrome Render Tools.

Use local, non-committed environment files to make differences between local development and production. .env may contain the default values for everyone, committed, and .env.local has your local tweaks, and you let git ignore that.

Use route wrappers to for example ease checking for anonymous or authenticated users, and do some calculations in there, so you don't need to do that in all kinds of places.

Offline first: have some javascript that runs in the background for hijacking netword requests. If you are offline, this should queue the network requests for later. IndexedDB could be more useful here than localstorage.

Use the ESLint command line utility to check the quality of your code, including your fellow developers.

Find me on Twitter: @devonwbernard.