The Opportunities section of your Lighthouse report listsall stylesheets with unused CSS with a potential savings of 2 KiB or more.Remove the unused CSSto reduce unnecessary bytes consumed by network activity:
How unused CSS slows down performance
Using a <link> tag is a common way to add styles to a page:
By default, a browser must download, parse, and process all external stylesheetsthat it encounters before it can display, or render, any content to a user's screen.It wouldn't make sense for a browser to attempt to display contentbefore the stylesheets have been processed,because the stylesheets may contain rules that affect the styling of the page.
Each external stylesheet must be downloaded from the network.These extra network trips can significantly increase the timethat users must wait before they see any content on their screens.
Unused CSS also slows down a browser's construction of therender tree.The render tree is like the DOM tree, except that it also includes the styles for each node.To construct the render tree, a browser must walk the entire DOM tree, and check which CSS rules apply to each node.The more unused CSS there is,the more time that a browser might potentially need to spend calculating the styles for each node.
Similar to inlining code in a <script> tag,inline critical styles required for the first paintinside a <style> block at the head of the HTML page.Then load the rest of the styles asynchronously using the preload link.
Consider automating the process of extracting and inlining "Above the Fold" CSSusing the Critical tool.
Consider removing unused CSS rules. Only attach the needed Drupal librariesto the relevant page or component in a page. See the Defining a libraryfor details.
Joomla
Consider reducing, or switching, the number of Joomla extensions loading unused CSS in your page.
WordPress
Consider reducing, or switching, the number of WordPress plugins loading unused CSS in your page.
Even if you use just one type of button on a page, it'll load all button styles. That's unused CSS. Reducing or removing unused CSS will improve your page speed performance and SEO.
In the Manage CSS & JS page option, set the CSS that should not be loading on the page or post to be unloaded and when you save and refresh that page in your browser. The disabled/removed unused CSS assets will no longer be loading on the page or post.
Unused CSS also slows down a browser's construction of the render tree. The render tree is like the DOM tree, except that it also includes the styles for each node. To construct the render tree, a browser must walk the entire DOM tree, and check which CSS rules apply to each node.
Solution (1): Yes, there is a thing such as using too much CSS. Everything must be used within limits, as overdoing negatively impacts the overall purpose. CSS is used to style the content and make a webpage visually appealing and presentable.
The Remove Unused CSS feature removes all CSS and stylesheets that are not used while keeping only the used CSS for each page. This feature can be enabled under the File Optimization tab, inside the Optimize CSS delivery feature, like this: Remove Unused CSS is the recommended method of optimizing your CSS.
The number of unused CSS files has no effect on how your site ranks in Google, but if you want to delete files you don't want there is always the delete key.
js simply bundles all CSS rules into some optimized files through PostCSS. In other words, it does not automatically remove unused CSS rules. Here is where PurgeCSS comes into play! Let's learn what PurgeCSS is, how it works, and how to configure it in a Next.
SnipCSS extracts all CSS styles associated with any portion of a webpage. It works on all websites, and after a few clicks you get the CSS, HTML and Images associated with the section of the website you are trying to recreate. ANY COOL DESIGN YOU SEE ON THE WEB CAN BE YOUR PERSONAL TEMPLATE FOR QUICK PROTOTYPING!
For example, Tailwind uses PurgeCSS to remove unused CSS from final builds automatically. Netflix Top 10 uses Tailwind on its entire website and only requires 6.5kB for the CSS file. The CSS file would be ten times the final build size without removing unused CSS.
Here are some steps you can follow to achieve this:
Use a performance analysis tool. Use a performance analysis tool like Google PageSpeed Insights, GTmetrix to identify the unused JavaScript and CSS on your website. ...
If you're using static pages, each with its own styles, you absolutely want to split your CSS into separate files. It will distinctly reduce the size of your payload with each page delivered. If every page has to deliver the CSS of all other pages, every time they load, that's a lot of unnecessary traffic.
By disabling CSS , the page content is displayed in the order of appearance in the code, so it's easy to check that the content is understandable in that order.
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