? How to Eliminate Render-Blocking CSS on Your Website (With Osclass Example)

Render-blocking CSS files can significantly slow down your website's loading speed, especially the First Contentful Paint (FCP) and Largest Contentful Paint (LCP)—two key metrics for Core Web Vitals. If you are running a job portal like CallCenterJob.co.in using Osclass, optimizing render-blocking CSS is a crucial step toward better performance and SEO.

? What Are Render-Blocking Resources?

Render-blocking resources are CSS or JavaScript files that prevent the browser from rendering any part of the web page until they are fully downloaded and processed.

When a visitor opens your site, the browser stops rendering while it waits for these files—causing delays that affect user experience and Google ranking.

? Examples of Common Render-Blocking CSS

Here are some typical render-blocking files found on an Osclass site:

? Goal: Load Styles Without Blocking Rendering

We’ll use these techniques:

• Preload with onload fallback

• Asynchronous CSS loading

• Inlining critical CSS

• Font optimization

• Lazy loading plugin CSS (like LightGallery)

✅ 1. Preload CSS Files (Non-Critical)

To make the browser start downloading your CSS early without blocking rendering, use:

Use this technique for:

• font-awesome.min.css

• all.min.css

• Your minified theme CSS file

✅ 2. Delay Plugin CSS (Like LightGallery)

Plugins like LightGallery are only used when someone views a gallery. So don’t load their CSS on every page.

You can lazy-load like this:

Only use this script after checking if the gallery is present in the DOM.

✅ 3. Google Fonts Optimization

Fonts from Google are render-blocking by default. Fix this by:

• Using font-display=swap

• Preconnecting to reduce DNS lookups

This lets text render with fallback fonts until Google Fonts load.

✅ 4. Inline Critical CSS (Above the Fold)

Use tools like Critical CSS or online generators to inline the styles needed to show:

• Logo

• Navigation bar

• Hero section

• Headings

Paste those styles into the inside a