<span>In</span> web development and exactly front-end web, we spend more time searching for the best design and content to our pages, it’s good but we miss to optimize our web pages.

Here’s an up-to-date (March 2020) guide on performance optimization for React apps. We’ll cover things such as memo, PureComponent, React.lazy and Suspense.

The responsive images spec is fantastic and covers a lot of use cases, but most of the time you’ll only need one: resolution switching using the `srcset` and `sizes` attributes.