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Wp-Rocket plugin exists as the caching and performance optimization plugin to upgrade the WordPress site’s loading speed. This plugin is free from complicated settings and features. It is simple to install and configure whether you have the skills of web development or not.A beginner can use it as per the manual guide and install it within 3 minutes. Still, If you find any complications to install so, you can contact our support. Our support will be there to assist you regarding the query. Additionally, if the encountered issue is the time taken so they may take time to fix it.

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How to improve speed indexing

Do you know how many seconds it takes for your website to load onto your visitor’s screen? The answer points toward the Speed Index (SI), a performance metric impacted by anything that deals with above-the-fold.

The Speed Index (SI) contributes to your overall performance score on the Lighthouse report. Maintaining a good Speed Index leads to a great user experience: it means that the content located in the viewport is delivered quickly. 

To improve your performance score, there are six metrics to optimize, and the Speed Index holds up 10% of this global grade computed by Lighthouse.  we need wp rocket nulled plugins for boost seo

What is a good Speed Index? How to measure it? Which tools are the most reliable? It can be overwhelming to run a performance audit for your website! 

Follow our step-by-step guide to control your Speed Index KPI and conduct an effective performance optimization process. We will explain the SI metric in detail, the free tools you can use to measure your performance, and some technical tips to apply to get a good SI grade (under 3,4 s).

What’s Speed Index in Lighthouse?

Speed Index is a Lighthouse performance metric that shows how quickly the content of a page is loaded and visible for the user. 

The Speed ​​Index indicates the loading time of the visible part above the fold of a web page (in the viewport). It measures the entire loading process of what users see before scrolling. 

In fact, Lighthouse takes a video of the loading process and calculates the difference between all the frames. Then, Lighthouse uses the Speedline Node.JS module to compute the final SI score. (You can find more information on this module on Github).

The Speed Index is the result of a calculation: it’s the average rendering speed of a web page and its visual progress, also called visual completion

It’s a meaningful lab metric for measuring loading time that directly affects how users perceive a website’s performance

Let’s illustrate this visual completion with two scenarios: page A is optimized, while page B is not: 

Explaining SI and the visual completion- Source: fasterize
📖 A low Speed Index score means that your page renders the visible content pretty fast, giving your visitors the perception of a faster loading page.

📖 SI metric is user-centric: it tracks visual progression.

What’s the Impact of Speed Index on Performance?

Speed Index is a load performance metric that shows how quickly elements of a page become visible in the viewport. How fast does your website seem to your visitors? That’s exactly the question you’re trying to answer when measuring your web performance! 

SI is represented on the image below, almost at the end of the visual completion process: 

Explaining the Loading Process – Source: dev.to 


Now, let’s see how the Speed Index compares to the 5 other KPIs measured by Lighthouse.

SI Weight on the Lighthouse Score

In the Lighthouse v8 Performance score, SI’s weight has been reduced from 15% to 10%. 

Lighthouse Scoring Calculator v8 (Including SI)  – Web.dev

How is the Speed Index Calculated by Lighthouse? 

Web.Dev explains that your Speed Index score is a “comparison of your page’s speed index and the speed indices of real websites”.

The V8 Lighthouse version computes six metrics to generate your final performance score. It includes the Core Web Vitals, the Total Time to Interactive, the Total Blocking Time, and finally, the Speed Index:

KPIWeightWhat’s a good score? (green zone)
First Contentful Paint10%0-2 s
Speed Index 10%0-3,4 s
Largest Contentful Paint25%0-2,5 s
Time to Interactive10%0-3,8 s 
Total Blocking Time30%< 200 ms
Cumulative Layout Shift15%0 – 0,1

Speed Index is an important lab metric because it defines whether your page is perceived as fast or slow. 

📖  Speed Index Formula: Interval time * (1 – visual completeness / 100)

Before we give you some technical recommendations to improve your SI if needed, we should determine what is a good SI score according to Lighthouse. 

And that leads us into the next section: the Speed Index threshold.  

What’s a Good Speed Index Score?

A good Speed Index score should be under 3,4 seconds. 

SI thresholds – Source: Web.dev

Speed Index vs First Contentful Paint 

If you are familiar with the recent Core Web Vitals update, the Speed Index metric may look similar to the First Contentful Paint (FCP) KPI.  Let me explain the main difference and why both metrics are important. 

First Contentful Paint is also a visual metric that measures the time until the browser first renders any content. Speed Index describes the rate at which the full content appears above the fold

FCP vs SI KPIs – Source: Fasterize


So whatever speeds up your FCP will improve your Speed Index metric (and it’s better for a user to see something instead of the scary white screen.)

Speed Index vs Cumulative Layout Shift

Whatever stabilizes the content above the fold, and improves interactivity will also help maintain a good Speed Index. To measure the visual stability, Google uses the Cumulative Layout Shift (CLS) from the Page Experience signals. CLS measures the sudden changes on a page that are unwanted by a user such as pop-ups or intrusive ads that ruin the user experience:

Illustrating CLS – Source: onely


Therefore, a good CLS score means good visual stability and can affect your SI positively. wp rocket nulled and boost traffic here

Maintaining a good SI is great for performance but also for marketing. Let’s see how. 

Four Marketing Benefits to Keep a Great Speed Index 

1. Lower your bounce rate

Well, imagine that you are trying to access a website, but instead of seeing any content right away, you are staring at a blank screen. What do you do? You leave.  wp rocket nulled and boost traffic

This scenario (that we all want to avoid) is called “a bounce”. Someone visits your website and leaves immediately without interacting further with your site.  wp rocket nulled and boost traffic

📖  Maintaining a good FCP and SI score will significantly reduce your bounce rate because the user will perceive your website as a fast one. 
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2. Increase your “time to spend on page” KPI

If you lower your Speed Index, then the users visiting your site will be willing to stay more on your site and visit more pages.  wp rocket nulled and boost traffic value in seo

3. Increase conversion rates 

When a user spends time on your site thanks to a good speed, you have another benefit: they are more likely to buy. You are answering their needs: find the answer or the product they want as quickly as possible. 

4. Boost your SEO

If your visitors enjoy the experience of being on your website, Google will like it too and will reward you with a better position in the search engine results. 

How to Measure Speed Index & wp rocket nulled and boost traffic

Lighthouse is an open-source tool that helps developers to measure Speed Index and other performance metrics. The automated tool creates in-depth reports about speed, performance, accessibility, UX, and SEO. 

🚀 Do you need help to measure your SI and to perform your website’s audit? Follow our complete guide that explains how to improve your Lighthouse performance score on WordPress

Which Tools to Measure Speed Index?

To measure Speed Index and your overall performance score, you can use Google PageSpeed Insights and GTmetrix, two popular tools powered by the Lighthouse technology.  wp rocket nulled and boost traffic


The tools are both providing a different SI score, but they are both in the green zone: 

  • SI score (PSI): 0,8 s
  • SI score (GT Metrix): 1.1 s
🚀 Running a performance audit is not always easy. Check our complete guide about testing WordPress site performance and speed. It will help you identify the tools you need and what are the acceptable thresholds for each metric. 

What Affects Speed Index? 

The causes of a high SI score can be identified in the diagnostics section of Google PageSpeed Insights. Usually, we have four main issues contributing to a bad SI score, namely:

  1. JavaScript code and unused JS
  2. JavaScript Execution time
  3. Main thread work
  4. Third-party code 
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Thanks to the “opportunities” and “diagnostics” sections generated by Lighthouse, you can find how to improve your SI and your performance grade. 

Opportunity and Diagnostics section – Source: PSI


The report determines how much impact each error has on your performance. Addressing them will drastically reduce your Speed Index grade and increase the overall user experience of your WordPress site.  wp rocket nulled and boost traffic

Our goal is straightforward: we want the visitor to see the above-the-fold content as soon as possible. 

To improve the Speed Index, we’ve listed the main recommendations coming from PSI: 

Now let’s see how to implement each of them. wp rocket nulled and boost traffic

How to Improve Speed Index: 8 Performance Tips

There are eight performance techniques to follow in order to improve the Speed Index and the overall speed of your WordPress site, namely: 

  1. Defer JS
  2. Delay JS and Remove Unused JS
  3. Minify JS and Minify CSS
  4. Optimize CSS Delivery and Remove Unused CSS
  5. Optimize Images + Lazy Load
  6. Use Data Compression
  7. Use a CDN
  8. Preload and Optimize Fonts
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Let’s dig into each of them. 

1. Defer JS 

The JS files will be loaded after the browser has displayed the most relevant content. This process allows the browser to load the full content without waiting for the scripts to load. 

By deferring the JS files, you also prioritize the type of content you want to show first. In our case, we should focus on anything above the fold: all the non-essential JS under the fold should be deferred. wp rocket nulled and boost traffic

🚨 Issues reported by Lighthouse: Eliminate render-blocking resources”, “Remove unused JavaScript” and “Avoid chaining critical requests”.

✅  Deferring JavaScript using popular wp rocket nulled plugin boost seo: 

  • WP Rocket has an option to defer the JS  WordPress files as shown below:
Load JS deferred feature - Source: WP Rocket’s dashboard
Load JS deferred feature – Source: WP Rocket’s dashboard
  • Asset CleanUp – this free plugin scans and detects the content to be loaded on the page in priority. Simply select the CSS or JS code that should not be rendered first. The plugin author recommends using Asset CleanUp with a cache plugin like WP Rocket to get the best performance results.
  • Speed Booster Pack – defers JS files after the whole HTML is rendered.
  • Async JS – gives you control of which scripts you want to add a ‘defer’ attribute. 

✅  Deferring JavaScript using the manual way

  • The Defer Attribute: Use the boolean attributes “defer” for the script tag in HTML, and it will defer the JS you want to target. With the defer attribute in place, the script file is downloaded in parallel while the HTML document is still parsing. The good thing is that the script is not executed until the HTML parsing is complete. best way to boost try wp rocket nulled plugin boost seo

<script src=”library.js” defer></script>

How the defer attribute works - source: jozefzacek.cz
How the defer attribute works – source: jozefzacek.cz

2. Delay JS and Remove Unused JS

Delaying JS execution and removing unused JS allows you to improve performance and your SI score. The Coverage tab in Chrome DevTools can help you find unused JavaScript code:  wp rocket nulled plugin boost SEO and increase traffic .

A code coverage report - Source: DevTools
A code coverage report – Source: DevTools


Another way to perform the audit and identify the JS to be optimized is to use PSI or GTmetrix:  wp rocket nulled plugin boost seo

Waterfall feature to identify the most heavy JS scripts - source: GTmetrix
Waterfall feature to identify the most heavy JS scripts – source: GTmetrix


🚨 Issues reported by Lighthouse: Reduce unused JS” and“Avoid chaining critical requests”.

✅ Manual solutions: 

  • Create a delay in JS execution with the setTimeout()method function. This will call a function after the time you’ll specify in ms. You can use those code snippets to delay the JS functions of your choice. 

Note: Lighthouse flags any file with more than 20kb of unused JS codetherefore delaying manually each JS file may be a bit off-putting.

✅  Use a WordPress plugin to delay JS:

  • Flying Scripts: a plugin to delay JS and give more resources to critical JS files. It helps to prioritize the JS  content that needs to be loaded in priority.  
  • WP Meteor: a plugin to postpone JS scripts and greatly improve the perceived speed by visitors.
  • Gonzales – allows to conditionally disable CSS and JS.
  • Perfmatters – helps speed up your site by disabling scripts that might not be used. 
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