![](http://web.archive.org./web/20240524183200im_/https://web.dev/static/explore/fast/cover.png)
Fast load times
What is speed?
Why does speed matter?
How to measure speed
How to stay fast
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Learn Performance
Web performance is a crucial aspect of web development that focuses on the speed at which pages load, as well as how responsive they are to user input. When you optimize your website for performance, you're giving users a better experience.
The initial release of this course focuses on web performance fundamentals, that beginners should find informative. Each module aims to demonstrate key performance concepts.
Overview
When building a modern web experience, it's important to measure, optimize, and monitor if you're to get fast and stay fast. Performance plays a significant role in the success of any online venture, as high performing sites engage and retain users better than poorly performing ones.
Sites should focus on optimizing for user-centric happiness metrics. Tools like Lighthouse (baked into web.dev!) highlight these metrics and help you take the right steps toward improving your performance. To stay fast, set and enforce performance budgets to help your team work within the constraints needed to continue loading fast and keeping users happy after your site has launched.