---
title: "Preload Critical Scripts to Improve Page Load Performance | bseoa"
description: "An important JavaScript file is being discovered late by the browser, which delays the interactivity of your page. You can give the browser a heads-up to downl…"
image: "https://www.blackseoanalyzer.com/static/images/black-seo-analyzer-og-image.png"
canonical: "https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/missing-preload-hint-for-script"
language: "en"
---

# Preload Critical Scripts to Improve Page Load Performance

JavaScript Analyzer

## What is this warning?

An important JavaScript file is being discovered late by the browser, which delays the interactivity of your page. You can give the browser a heads-up to download this file sooner by 'preloading' it. This can significantly improve your page's load time and user experience.

## How to Fix This Issue

### How to Fix It

#### The Problem

A critical script is loaded normally, without being prioritized.

#### The Solution

Add a `<link rel="preload">` tag for the script in the <head> of your HTML. This tells the browser to start downloading it with a high priority.

```
<link rel="preload" href="/js/critical-script.js" as="script">
```

#### Why This Works

Preloading separates downloading from execution. It ensures the script is ready to be executed the moment it's needed, which can improve metrics like Time to Interactive (TTI). For more details, see Google's documentation on [preloading critical assets](https://developer.chrome.com/docs/lighthouse/performance/preload-critical-assets/).

### 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 JavaScript Analyzer issues

- [Add crossorigin Attribute for Better Error Logging](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/missing-crossorigin-attribute)
- [Audit Third-Party Scripts for Performance and Security](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/third-party-script-loaded)
- [Avoid document.write for Better Performance and Security](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/document-write-usage)
- [Avoid eval() Due to Significant Security Risks](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/eval-usage)
- [Avoid Synchronous Scripts in <head> to Speed Up Rendering](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/synchronous-script-in-head)
- [Clarify Script Loading by Removing Redundant async and defer](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/redundant-async-and-defer)
- [Correct Unknown Script type for Proper Execution](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/unknown-script-type)
- [Deprecated JavaScript APIs: document.write, escape() and Inline Handlers](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/deprecated-api-usage)
- [Enhance Security by Loading All Scripts Over HTTPS](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/insecure-script-load)
- [Improve Code Maintainability by Avoiding Inline Event Handlers](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/inline-event-handler)
- [Improve Performance by Externalizing Large Inline Scripts](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/large-inline-script)
- [Improve Security with Subresource Integrity (SRI) for CDN Scripts](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/missing-integrity-attribute)
- [Modernize Your HTML by Removing Unnecessary Script type Attributes](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/unnecessary-type-attribute)
- [Optimize JavaScript Module Loading](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/module-without-async)
- [Optimize Loading of Blocking Third-Party Scripts](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/blocking-third-party-script)
- [Optimize Script Loading to Prevent Page Rendering Delays](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/render-blocking-script)
- [Remove console.log Statements from Production Code](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/console-log-usage)

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