---
title: "Reduce Size of Critical Resources for Faster Page Loading | bseoa"
description: "A critical resource (CSS or JavaScript file) that's needed for initial page rendering is too large. Large critical resources delay the time it takes for users …"
image: "https://www.blackseoanalyzer.com/static/images/black-seo-analyzer-og-image.png"
canonical: "https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/large-critical-resource"
language: "en"
---
# Reduce Size of Critical Resources for Faster Page Loading
Performance Analyzer
## What is this warning?
A critical resource (CSS or JavaScript file) that's needed for initial page rendering is too large. Large critical resources delay the time it takes for users to see content, negatively impacting Core Web Vitals and user experience.
## How to Fix This Issue
### How to Fix It
#### The Problem
A critical CSS or JavaScript file is over 100KB, causing delays in page rendering.
#### The Solution
Split large critical resources into smaller chunks, inline only the most critical parts, and defer non-critical portions.
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```
#### Why This Works
Smaller critical resources load faster, allowing the browser to render content sooner and improving First Contentful Paint and Largest Contentful Paint metrics.
### SEO Impact
This issue can affect your site's search engine rankings and user experience. Addressing it promptly helps ensure optimal performance and visibility in search results.
### Automatic Detection
bseoa automatically checks for this warning during site analysis, along with hundreds of other technical SEO issues.
## Other Performance Analyzer issues
- [Add width and height Attributes to Images to Prevent Layout Shift](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/image-dimensions)
- [Add Cache-Control Headers to Improve Browser Caching](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/missing-cache-control-header)
- [Add Crossorigin Attribute to Font Preloads for Better Performance](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/font-crossorigin)
- [Add Media Attributes to Stylesheets for Conditional Loading](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/stylesheet-media-attribute)
- [Add Preload Hints for Critical Resources to Improve Loading Performance](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/missing-preload-hint)
- [Add Preload Hints for Important Scripts to Improve Loading Performance](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/script-preload-hint)
- [Eliminate Render-Blocking JavaScript to Speed Up Page Load](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/render-blocking-script)
- [Enable Text Compression to Reduce File Sizes](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/resource-not-compressed)
- [font-display: swap Explained: Stop Invisible Text While Fonts Load](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/font-font-display)
- [Implement Cache Busting for Static Resources to Ensure Updates](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/missing-cache-busting)
- [Implement Responsive Images for All Device Sizes](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/responsive-image)
- [Increase Browser Cache Times for Static Assets](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/insufficient-cache-time)
- [Load Print Stylesheets Asynchronously to Improve Performance](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/print-stylesheet-loading)
- [Optimize Critical Rendering Path for Faster Page Display](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/long-critical-path)
- [Preload Critical CSS for Faster Page Rendering](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/critical-css-preload)
- [Preload Critical Scripts for Faster Interactivity](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/critical-script-preload)
- [Serve Images in Modern Formats like WebP for Faster Loading](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/image-not-optimized)
- [Use preconnect to Speed Up Connections to Third-Party Domains](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/missing-preconnect-hint)
- [Use Async Loading for JavaScript Modules to Prevent Render Blocking](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/module-needs-async)
- [Use Efficient Font Formats for Better Web Performance](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/font-format)
- [Use Lazy Loading for Off-Screen Images to Improve Performance](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/lazy-load-image)
- [Use the Modern WOFF2 Font Format for Better Compression](https://www.blackseoanalyzer.com/en/technical-seo/performance-analyzer/font-not-woff2)
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