SEO Guide to Lighthouse Performance Metrics

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All businesses put efforts to get ranked quickly and dominate the SERP by attaining the #1 ranking position. It is not as easy as saying; it requires an experienced SEO professional to build a good strategy and implement it. Holding a top-notch ranking position can be possible if you follow all guidelines and optimize the website as per Google’s algorithms. When it comes to the algorithms, the most important factor is the website’s performance. There are different types of Google authorized online tools available that can help you in inspecting websites accordingly. Lighthouse is an important one. 

What Is Google Lighthouse?

Lighthouse is a specific tool that can be useful in testing the website quickly. It is an automated and open-source tool that anyone can use. This particular tool inspects your website by paying attention to the following things. 

  • Performance 

  • Accessibility 

  • Best Practices 

  • Search Engine Optimization 

  • Progressive Web Apps 

These are some major audits that an SEO expert runs by using Lighthouse. You can use this particular tool for testing the complete website or a particular web page. There are multiple sources available by which you can access its services, such as – 

  • Node module 

  • Command-line 

  • Website: PageSpeed Insights 

  • Chrome DevTools 

  • Chrome Extension 

Method selection completely depends on your convenience. You can get a different interface and way of using in all methods or sources, but the results will be the same. 

How Can Google Lighthouse Performance Metrics Audit Your Website?

A website audit is the only by which you can understand you have an SEO-friendly website to get ranked or not. In case you do not have an SEO-friendly website as per Google guidelines, your competitors can easily beat you. Before facing any bad result or unfavorable conditions, an SEO professional always considers Google Lighthouse and check out website performance.

The performance metrics are useful in testing the website’s performance and figuring out where it is lacking to get ranked by impressing Google crawlers. Google crawlers pay attention to two major things only, such as – SEO and user-friendliness only. In case your website is not perfect for serving the audience effectively, you may not get ranked. Similarly, performance metrics work.

First Contentful Paint – With the help of these particular metrics, the tool defines the time consumes by your website to present the first image or text on the screen.

First Meaningful Paint – It calculates the total time consumes by the website’ main content fully appearing in front of the users.

Speed Index – Its function is simple. It helps in understanding how much time your website consumes in loading and presenting the complete content.

Interactive Time – Appearing the first content and full interaction, both are different. This metric helps figure out the complete time taken by the website to interact with the users.

First CPU Idle – With the first CPU idle metric values, you can know when your website system runs the user’s request.

Estimated Input Latency – It is completely dependent on the time consumption of the first CPU idle metric. Mainly, it helps in figuring out the reaction time of the web application or web page. In case your website’s latency goes above 50 ms or 5 seconds, you should focus on optimizing and improving the website’s speed.

These are some major performance metrics used by Google Lighthouse to test your website and present a perfect performance report.

How To Improve Website’s Speed According To Lighthouse Performance Metrics?

No one wants to deal with a problematic or poor performance website in the online marketplace. All companies want to serve the audience with the best sources. They have to impress them quickly and generate several business leads.

People who get Google Lighthouse performance metrics report negative or want to figure out a perfect solution with some lower trends. The individuals are looking for the best tips by which they can make changes in the website and boost the speed quickly.

Extend Browser Caching

Browser caching is a specific technique by which a browser stores website cache. Stored cache makes things much easier for the system while running the same website again. Generally, the system keeps some basic things about the website safe and increases the speed of loading website content quickly.

These types of files are associated with specific time duration. You should try to extend the limits of website browser caching that allows your website data to keep secured and safe in the browser for a long.  

Image Optimization

Many individuals add several visuals to the website to increase attractiveness and keep the visitors engaged. Mainly, these visuals are available on the web pages in the form of images only. In case you upload images large in size, you may face negative effects as well, such as – higher website loading time.

It can negatively impact the users and mark some bad factors in the Lighthouse performance report. Image optimization is the only option here that can help you come up with a perfect solution. Some people think image optimization is to decrease the image quality to reduce the size and keep the website lighter.

In reality, image optimization works by reducing the overall size without compromising the quality factor. It can be possible by changing the image format. The JPEG XR, JPEG 2000, and WebP are some major image formats that can provide high-quality images at smaller sizes.

Deliver Smaller Payloads

Everyone may be introduced to the folder zipping method that can be useful in minimizing the size of a folder without compromising with the content. Compression of HTML, JavaScript, and CSS files is also one of these. It works by shrinking the sizes of files by which the website becomes lighter.

The biggest aspect here is minification. It is a specific method where the system figures out some useless or less important code characters and shrinks them without any changes in functions or operations. It can also work by removing unnecessary strings, formatting, carriage returns, and comments.

Eliminate Render Blocking

Render blocking represents the process of taking permission by the browser to download website content and process the user’s or client’s request. Here, the browser has to download external JavaScript and CSS files for the website’s appearance.

These things lead to excessive time consumption that can be a big problem and slow down the complete process. It is the biggest reason that’s why the professionals try to remove render-blocking and speed up the process of loading content.

Final Words


By paying attention to these details, you can understand lots of things about Google Lighthouse and its performance metrics. If you hire the best SEO experts and services, you can easily deal with it. A professional SEO analyst has deep knowledge about these elements and knows how to keep the website properly optimized.

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