Share a few tips for optimizing CSS loading

In today's Internet era, Web applications are becoming more and more complex, and the topic of front-end performance is becoming more and more important. In order to provide a better user experience and higher conversion rates, we need to reduce page load time as much as possible and optimize front-end performance. CSS is an important part of web page style, and its loading speed is also critical. In this article, we will share several tips for optimizing CSS loading to help us better improve front-end performance.

1. Minimize CSS files

Compressing CSS files can reduce file size and improve loading speed. Common CSS compression tools include YUI Compressor and CSSNono. Additionally, use CSS language hierarchies such as Sass or Less to reduce duplicate code and length. During this process, attention needs to be paid to retaining sufficient readability to ensure future modification and maintenance.

2. Using CDN

CDN (Content Delivery Network) can cache static resources in a site or application to globally distributed servers and return these resources to user. This will result in faster application load times while reducing the load on the origin server. By using a CDN, CSS files load faster and can be distributed efficiently among users in multiple locations.

3. Embed CSS

Embed CSS into HTML files to help reduce HTTP request and response times. While the files may be larger, overall load times will be faster. Use CSS preprocessors such as Sass and Less to better organize styles during the embedding process.

4. Lazy loading of CSS

Looking at it from a different perspective, lazy loading of CSS is a way to stop loading global CSS files. By lazy loading CSS, you can make pages load faster while increasing rendering speed and reducing CPU usage. This is a somewhat complex strategy that requires many factors to be considered and needs to be used appropriately.

5. Optimizing selectors

Optimizing selectors is another way to reduce load times. You can limit the selector to a specific element by adding a class name or ID before the selector, thereby reducing the number of elements the browser evaluates. Likewise, try to avoid using complex selectors such as wildcards and nested selectors. For the same reason, you should try to avoid using a large number of CSS rules and media queries.

6. Avoid unnecessary CSS rules

Each CSS rule takes a certain amount of time to calculate and render. Therefore, avoid unnecessary rules and reduce the number of style blocks. Using browser development tools supported by modern browsers such as Chrome, Safari, Firefox, Edge, etc. is a great way to identify and remove unnecessary rules.

Summary:

Minimizing CSS files, using CDN, embedding CSS, lazily loading CSS, optimizing selectors and avoiding unnecessary CSS rules are 6 ways to optimize front-end performance. As we consider these tips, we should think about our designs to ensure that we are achieving optimal front-end performance without compromising user experience or visuals. Building a reusable and maintainable code base and sharing known optimization practices with fellow developers is one way to improve website performance.

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