---
title: "Improve Performance by Externalizing Large Inline Scripts | bseoa"
description: "Your page has a large amount of JavaScript code written directly in the HTML. This is called an 'inline script.' It increases the size of your HTML document, w…"
image: "https://www.blackseoanalyzer.com/static/images/black-seo-analyzer-og-image.png"
canonical: "https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/large-inline-script"
language: "en"
---

# Improve Performance by Externalizing Large Inline Scripts

JavaScript Analyzer

## What is this warning?

Your page has a large amount of JavaScript code written directly in the HTML. This is called an 'inline script.' It increases the size of your HTML document, which can slow down the initial page load. It also prevents the browser from caching the script, meaning it has to be downloaded again on every page visit.

## How to Fix This Issue

### How to Fix It

#### The Problem

A `<script>` block in your HTML with hundreds of lines of JavaScript.

#### The Solution

Move the JavaScript code into its own file (e.g., `app.js`) and link to it from your HTML.

```
<!-- Replace the large script block with this -->
<script src="/js/app.js" defer></script>
```

#### Why This Works

Externalizing scripts allows the browser to cache them. This means that after the first visit, the script doesn't need to be re-downloaded, leading to faster load times on subsequent pages. It also makes your code much cleaner and easier to manage.

### 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 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)
- [Preload Critical Scripts to Improve Page Load Performance](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/missing-preload-hint-for-script)
- [Remove console.log Statements from Production Code](https://www.blackseoanalyzer.com/en/technical-seo/javascript-analyzer/console-log-usage)

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