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What is Critical CSS, definition
Cascading Style Sheets allow you to give an aesthetic to the content with precise indications. However, they can slow down the web page. Critical CSS is a methodology sweden phone number for optimizing page rendering times that allows you to load only what is needed above the fold. That is to say the most important and delicate section to improve the user experience.
With the Critical CSS function (the English term critical stands for important in this case) we prevent the browser from downloading all the style sheet files. But we suggest analyzing only those that are needed in the first loading phase . To then work on the rest at a later time.
Implementing Critical CSS on your ecommerce, blog or website - especially those with a large number of features related to style sheets - means facilitating the rendering of the first part of the web page when the user executes the request. We are in the most delicate phase , the one in which you must immediately communicate to the user that you are there in the best possible way.
First Contentful Paint (FCP) is a key metric that measures just that: the time it takes the browser to render the first piece of content.
The presence of Critical CSS can help to substantially lower the values that make the loading of the web page heavier. Especially if you work from mobile with precarious connections. See how the loading work changes thanks to this timeline taken from Google's .