What is a resource that prevents rendering?

Render-blocking resources refer to CSS and JavaScript files that prevent a page from rendering until it has been fully downloaded and processed by the browser.

Impact of render-blocking resources

These resources can have a significant impact on Web Vitals, especially LCP (maximum content painting) and FCP (first content painting).LCP measures the time it takes for the largest element on the page to become visible, while FCP measures the time it takes for the first part of the content to become visible. If a site's total blocking time is too long, the browser takes longer to download and process these resources, resulting in slower LCP and FCP times. Larger DOM sizes can also cause problems.

How do I analyze render blocking issues on my website?

1. Using Google PageSpeed Insights

This is a free online tool that analyzes the performance of web pages on desktop and mobile devices. Simply enter your website URL and click "analyze" button, which will provide you with performance metrics (such as FCP and TTI) and suggestions for improvement.

2. Using Chrome DevTools

Chrome DevTools is a development tool built into Google Chrome that helps you analyze and optimize website performance. Utilizing the "site coverage"tab and "waterfalls", you can see which sections are loading and executing, as well as unused sections of code.

How to eliminate render-blocking resources?

1. Compress CSS and JavaScript files

Reduce file size by removing spaces, comments and unnecessary code. The following plugins can be used:

• WP Rocket

• Autoptimize

• WP Super Minify

2. Implementing asynchronous loading

Asynchronous loading can load multiple resources at the same time, reducing blocking time. Recommended plugin:

• WP Rocket
• Autoptimize
• Flying Scripts

3. Delayed JavaScript loading

Delays the loading of non-critical JavaScript files until the page is fully loaded.

Recommended Plugins:

• WP Rocket
• Perfmatters

4. Optimize CSS delivery with Critical CSS

Load critical CSS inline and delay loading of non-critical CSS. recommended plugin:

• WP Rocket
• Autoptimize
• Flying Scripts
• WP Compress

• Asset Cleanup
• Perfmatters

5. Eliminate unused CSS and JavaScript

Remove unused code to reduce file size. Recommended plugin:

• Perfmatters
• WP Rocket
• WP Compress
• Asset Cleanup

How do I fix common problems when fixing render-blocking resources?

1. Handling jQuery and WordPress

Avoid delaying or postponing the loading of jQuery files to prevent problems with your site.

2、Solve the problem of flickering unstyled content (FOUC)

Use media properties to load CSS files only when needed or to delay loading non-critical CSS files. Delay loading images and other media to improve performance.

Monitor and maintain performance

Conduct regular performance audits to identify and optimize load times and SEO rankings. Use tools like GTmetrix or DebugBear to monitor and implement continuous improvement strategies.

summarize

By regularly testing and monitoring your website's performance, you can ensure that your website loads quickly on a variety of devices and browsers, improving user experience and search engine rankings. Continuous learning and optimization ensures that your website is always at its best.

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