Easy Tips for Optimizing CSS Delivery

0 Comment Admin 2016-01-22
Easy Tips for Optimizing CSS Delivery

In order to optimize the performance of a website, and ensure it provides excellent user experience, it’s important to optimize CSS delivery. Unfortunately, most developers don’t focus on this aspect of optimization, and end up hurting their chances of generating more leads. It’s important to understand the significance of optimized CSS delivery. 

Before a web browser can render content from a web page, it needs to process the layout information and style for that particular web page. Due to this, the web browser tends to block rendering until some external stylesheets are processed and downloaded. This may require multiple round trips and even delay the time to render. 

According to experts, it’s recommended to seek professional help to learn more about render tree layout, paint and construction. It helps you understand everything about the important rendering path and render-blocking CSS. Professional experts can also provide you with some tips to improve CSS delivery and unblock rendering. In this post, we’ve given some recommendations to help you out. 


Effective Tips to Optimize CSS Delivery

In case the external CSS resources seem small, you can easily insert them directly into the specified HTML document. This is called inlining. When you inline small CSS in this specific manner, it allows the web browser to proceed with rendering the web page. You need to make sure the CSS file is small. In case it’s small, inlining the CSS can cause the PageSpeed Insights to provide you with a warning about the above-the-fold portion of the web page. This may lead to disruptions in the content. 

In case you have a large CSS file, you need to inline and identify the CSS required for properly rendering the above-the-fold content. This also helps you defer loading all the remaining styles until the mentioned content. If you take this approach, the critical styles required to style all the above-the-fold content are applied and inlined to the specific document immediately. 

The complete small.css is loaded after the page has been painted in the initial stages. The styles are applied to the web page when it finished loading. Moreover, it doesn’t block the initial render of important content. You need to understand that the web platform soon supports loading stylesheets in a specific non-render blocking manner. It doesn’t resort to using or focusing on JavaScript. 


Never Inline Large Data URLs

While inlining data URLs in large CSS files, you should be careful. Some developers think that selective use of some small data URLs in the CSS makes sense. However, inlining large data URLs may cause the size of the above-the-fold CSS to increase. This slows down the overall page render time. 


Never Inline CSS Attributes

Last but not the least, you need to understand that it’s better to avoid inlining CSS attributes. When you try to inline CSS attributes on various HTML elements, it may cause problems. It can lead to unnecessary and unwanted code duplication. In addition to this, inlining CSS on HTML elements can be blocked by CSP or Content Security Policy. For more information, you should consult experts in the industry.
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