What is Magento 2 Above The Fold Content? What is Critical CSS in Magento 2

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? Role of Eliminating Render-Blocking Resources in Magento 2 Best Practices to Remove Render-blocking Resources in Magento 2 Above The Fold Key Benefits of Using CSS for Above the Fold Content FAQs Summary What is Magento 2 Above The Fold Content

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What is Critical CSS in Magento 2? 📖 Key Definition Box Key Components: Extraction: Finding which CSS rules affect above-the-fold content

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Deferred Loading: Loading the remaining CSS in the background after critical content renders RELATED QUESTION "Is Critical CSS the same as deferred CSS loading?" No

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How to Load Magento 2 Above The Fold Content Via Critical CSS?

Q: Blog Tutorials Contact Us Get Started How to Load Magento 2 Above The Fold Content Via Critical CSS? Quick Answer / TL;DR If your e-store loads above the fold content in over 2 seconds, you lose sales

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Q: Is your Magento 2 store slow to show content? The Magento 2 above the fold area loads first and shapes user experience

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Q: ? How does Critical CSS work in Magento 2

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Q: ? Why Use Magento 2 Above The Fold Content Via Critical CSS

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Q: ? How to Load Magento 2 Above The Fold Content Via Critical CSS

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Q: ? Above-the-fold content in Magento 2 covers the section users see first, before scrolling

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Quick Answer / TL;DR

If your e-store loads above the fold content in over 2 seconds, you lose sales. Critical CSS speeds it up by inlining only essential styles and deferring the rest. Enable it via admin or CLI, add a critical.css file, and boost page speed and conversions by 7–20%.

Is your Magento 2 store slow to show content? The Magento 2 above the fold area loads first and shapes user experience. Fast rendering keeps users engaged and reduces bounce rates.

This article covers how to speed up the above the fold content using Critical CSS.

What is Magento 2 Above The Fold Content?
What is Critical CSS in Magento 2?
How does Critical CSS work in Magento 2?
Why Use Magento 2 Above The Fold Content Via Critical CSS?
How to Load Magento 2 Above The Fold Content Via Critical CSS?
Role of Eliminating Render-Blocking Resources in Magento 2
Best Practices to Remove Render-blocking Resources in Magento 2 Above The Fold
Key Benefits of Using CSS for Above the Fold Content
FAQs
Summary

What is Magento 2 Above The Fold Content?

What is Magento 2 Above The Fold

Above-the-fold content in Magento 2 covers the section users see first, before scrolling. This area has the header, navigation bar, hero image, and top banners. These elements shape the user's first impression.

Magento loads CSS and JavaScript files before rendering content. Large resources during this stage slow down First Contentful Paint (FCP) and hurt UX. Many Magento 2 themes contain bulky files and third-party scripts. These assets block the browser from showing visible content.

To deliver content quicker, developers use Critical CSS and defer JavaScript parsing. These techniques load only essential styles and scripts first. The rest loads after the visible area appears. Focusing on what users see first leads to better UX and SEO performance.

What is Critical CSS in Magento 2?

📖 Key Definition Box

Key Components:

Extraction: Finding which CSS rules affect above-the-fold content.
Inlining: Putting these critical styles right in the HTML <head>.
Deferred Loading: Loading the remaining CSS in the background after critical content renders

How does Critical CSS work in Magento 2?

Critical CSS works like a VIP pass for your most important styles. When VIP guests skip the line, these styles don't wait for all CSS to load before styling your page.

🎯 TRY THIS (Collapsing Box)

Why Use Magento 2 Above The Fold Content Via Critical CSS?

Reason	Explanation
1. Faster First Paint	Critical CSS loads styles required for above-the-fold content. The browser renders visible content without waiting for full CSS files. Users view meaningful elements, which boosts engagement. A faster first paint improves FCP and user experience. Magento stores with heavy themes see major gains. Performance scores improve when the page loads key elements first.
2. Lower Bounce Rate	Quick content display keeps users on the site. Visitors leave when a page loads too slow. Above-the-fold optimization shows value in seconds. Faster rendering encourages users to scroll and explore. Improved visual load time reduces bounce rate. Better engagement helps raise conversions.
3. Better Mobile Experience	Mobile devices struggle with large files and heavy themes. Critical CSS cuts that load by focusing on visible content. Faster initial rendering improves the mobile journey. Users stay longer when they see content right away. Mobile users expect speed on weak networks. Magento stores must focus upon mobile performance.
4. Improved Core Web Vitals	Google ranks pages based on Core Web Vitals. Critical CSS helps Magento meet benchmarks for LCP and FID. Faster visual load supports better scores. Magento SEO improves when content loads without delay. Magento sites with optimized fold content gain visibility. These improvements increase organic traffic.
5. Fewer Render-blocking Resources	Full CSS files delay rendering. Critical CSS removes this block by loading only what's needed first. The browser skips unused styles during the initial paint. It reduces requests and speeds up display. Magento pages load in a smooth manner when you control resource priority. Users interact faster with content that appears early.

How to Load Magento 2 Above The Fold Content Via Critical CSS?

Step 1: Install Critical CSS Generator

Use a tool like Penthouse, Critical, or CriticalCSS.com.

Install using npm:

npm install -g critical

Or add it to your Magento 2 project with:

npm install --save critical

Step 2: Generate Critical CSS for Each Page Type

Run the tool on key page templates:

Homepage
Category page
Product page
CMS page

Example using critical CLI:

critical https://example.com/ --base=/path/to/css/ --css=styles.css --width=1300 --height=900 --extract --minify --inline --target critical.css

It generates a minified CSS file for above-the-fold content.

Step 3: Place Critical CSS Inline in the Head

Magento 2 loads styles from layout XML. Add your Critical CSS inside the <head> using layout XML updates:

Create or edit this file:
app/design/frontend/Vendor/theme/Magento_Theme/layout/default_head_blocks.xml

<head>

`<css src="css/critical-home.css" inline="true" />`

</head>

Use different default_head_blocks.xml files per page type if needed.

Step 4: Defer Main CSS File Loading

Defer the rest of the CSS to load after page render:

Use rel="preload" or rel="stylesheet" with media="print":

<link rel="preload" as="style" href="styles.css" onload="this.onload=null;this.rel='stylesheet';">

<noscript><link rel="stylesheet" href="styles.css"></noscript>

It ensures fast render without blocking.

Step 5: Disable Magento’s Default Merging and Minification (Temporary)

To test your Critical CSS setup, disable merging and minification:

php bin/magento config:set dev/css/merge_css_files 0

php bin/magento config:set dev/css/minify_files 0

php bin/magento cache:flush

Enable them again once you verify everything works.

Step 6: Test With Google PageSpeed Insights

Check LCP (Largest Contentful Paint) and render time.

Make sure:

Above-the-fold content renders fast
Styles load without flash of unstyled content (FOUC)

Role of Eliminating Render-Blocking Resources in Magento 2

Reason	Description
1. Speeds up First Contentful Paint (FCP)	Clearing render-blocking resources lets the browser show visible content earlier. It cuts delays caused by unused CSS or JavaScript.
2. Speeds up Largest Contentful Paint (LCP)	Pages load faster when Magento skips non-critical styles during initial rendering. The main image or heading appears without delay.
3. Increases PageSpeed Insights Score	Core Web Vitals get better when the browser loads only the critical resources. Better scores lead to higher search visibility.
4. Betters User Experience	Users interact sooner when content becomes visible without waiting. Fast feedback keeps users engaged.
5. Boosts Mobile Performance	Mobile users get quick access even on slow networks. Fewer render-blocking files cut page weight and save bandwidth.

Best Practices to Remove Render-blocking Resources in Magento 2 Above The Fold

1. Minify and Bundle JavaScript

Minify JavaScript for Magento 2 Above The Fold

Remove unneeded characters from JavaScript files to shrink file size.
Combine different JavaScript files into one to cut the number of HTTP requests.
Go to Stores > Configuration > Advanced > Developer in the admin panel.
Open the JavaScript Settings section.
Set Enable JavaScript Bundling and Minify JavaScript Files to Yes.
Click Save to apply the configuration.

2. Minify and Bundle CSS

Magento themes often load large CSS files that block rendering.
Open Stores > Configuration > Advanced > Developer in the admin panel.
Expand the CSS Settings section.
Turn on both CSS minification and CSS bundling options.
These settings cut payload size and loading time.
Save the changes to apply the update.

3. Add Critical CSS Inline

Add Critical CSS Inline for Magento 2 Above The Fold

Identify styles needed to render above-the-fold content.
Add these styles into the head section of your layout files.
Magento supports inline CSS through layout XML.
Apply this method to cut the number of style-related HTTP requests.
Limit the inline CSS to essential visual elements only.
This step speeds up visible content rendering.

4. Defer Parsing of JavaScript

Apply tools like GTMetrix to find render-blocking scripts.
Add the defer attribute to non-critical script tags.
Locate these scripts in app/design/frontend/{Vendor}/{Theme}/Magento_Theme/layout.
Example: <script src="your_script.js" defer></script>
The browser will load these scripts after showing the main content.
Defer only non-essential scripts to avoid functionality issues.

5. Use Magento 2 Defer Parsing Extension

Magento 2 Above The Fold through Magento 2 Defer Parsing Extension

Manual changes can cause errors when done across many files.
Install a free Magento 2 extension to defer JavaScript parsing.
Set site-wide defer rules without editing each script by hand.
Configure the extension to exclude certain pages if needed.
This method cuts workload and speeds up the page.
Apply it to keep consistency across the storefront.

Key Benefits of Using CSS for Above the Fold Content

1. Faster First Contentful Paint (FCP)

Critical CSS gets content on screen 30-50% faster by clearing render-blocking resources.

How it works:

Step 1: Browser receives HTML with inlined critical styles
Step 2: Content renders right away using these styles
Step 3: FCP happens 30-50% sooner than with traditional CSS loading

2. Better Core Web Vitals Scores

Google's Page Experience signals focus on LCP and CLS metrics. Properly using Critical CSS makes both stronger.

📚 TERMINOLOGY BOX (Collapsing Box)

3. Higher Conversion Rates

Faster-loading pages keep users engaged. They move toward the buy with less abandonment at each step of the sales funnel.

Australian retailer SurfStitch used Critical CSS to speed up their pages. They saw a drop in bounce rate and a rise in conversions.

FAQs

1. What is Magento 2 above-the-fold content and why does it matter?

Above-the-fold content in Magento 2 includes the visible section users see before scrolling. It covers the header, navigation, and hero image, which shape the first impression. Magento loads many CSS and JavaScript files before showing this area. Heavy assets delay rendering, hurt performance scores, and drive users away. Fast, visible content boosts engagement and supports stronger SEO.

2. How does Critical CSS speed up Magento 2 pages?

Critical CSS loads only the styles needed to render visible content. The browser skips full CSS files and paints the page faster. This method cuts render-blocking resources and speeds up First Contentful Paint (FCP). Users see meaningful content without delay, which boosts retention and conversion.

3. How can you add Critical CSS to Magento 2?

Install a tool like Critical or Penthouse to create CSS for key page types. Run it for the homepage, category, product, and CMS pages. Place the output CSS inline in the <head> using default_head_blocks.xml. Defer the main CSS with rel="preload" or media="print" to stop it from blocking rendering. Apply Magento’s layout system to control where and how styles load.

Voice Search Questions

Hey Google, how long does implementing Critical CSS in Magento take?

The right tools let you set up Critical CSS in Magento 2 in about 2-4 hours. Most of that time goes to creating the right critical CSS for your site and testing it. The actual setup takes a few minutes.

Does Critical CSS affect Magento 2 design or functionality?

No, if done correctly. Critical CSS only includes styles for above-the-fold content. The rest of the CSS still loads, just deferred, so the full design appears as users scroll. Make sure to test across devices to avoid flash of unstyled content (FOUC) or layout shifts. When properly implemented, users won’t notice a difference in visuals, just faster load times.

4. Can Critical CSS be automated for Magento 2 stores?

Yes. You can automate generation and injection of Critical CSS using tools like PageSpeed Module, Magento-specific performance modules, or CI/CD scripts. These setups monitor layout changes and regenerate critical styles when needed. This reduces manual effort and keeps performance optimized even after design updates.

Summary

Tuning Magento 2 above the fold content betters speed and SEO. It loads key visuals without waiting for full CSS. It also reads to better Core Web Vitals like FCP and LCP.

Next Steps:

Turn on Critical CSS in your development environment
Create and test your critical.css file
Look into advanced setups for complex stores

TRY THIS - 30-DAY CHALLENGE

Your Critical CSS Implementation Roadmap:

Week 1: Enable and implement basic Critical CSS
Week 2: Test and optimize your critical.css file size
Week 3: Measure performance improvements and fix any issues
Week 4: Explore advanced techniques like route-specific Critical CSS

Consider managed Magento hosting to achieve better loading speed for e-stores.

Shivendra Tiwari

Technical Writer

Shivendra has over ten years of experience creating compelling content on Magento-related topics. With a focus on the Magento community, he shares valuable tips and up-to-date trends that provide actionable insights.