How to Check Website Speed: Key Metrics, Tools, and Optimization Tips

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  • 21 Sep 2024
How to Check Website Speed - Key Metrics, Tools, and Optimization Tips

 

In today’s world of super high internet speed 🚀, website speed is considered more than just a technical detail, it’s a critical factor that can make or break your online business. Fast-loading websites don't just make a good impression, they directly affect user experience, SEO rankings, traffic, and conversion rate. A slow page loading time ⏳ will irritate users, drive potential customers away, and negatively affect your search engine performance.

 

Imagine you click on a website, and it keeps loading... 😤 It’s frustrating, right? According to research, customers switch to the faster site even if there is a slight delay than the competitor's site. LoadStorm research revealed that 64% of customers won’t return to an e-commerce site if it’s slow to load 🛑. Google also states that just a 0.5-second delay can result in a 20% traffic drop 📉. It’s almost scary how big of an impact page speed has. That’s where 'How to Test Your Website Speed: Metrics, Tools, and Optimization Tips' becomes important.

 

"Fast websites are the key to captivating first impressions—because in the digital world, every millisecond counts ⏱️."
- Codemafias

 

For any developer or website owner, it is important to take time and study your website speed 🕵️‍♂️. In this guide, we’ll walk you through how to test your site’s speed, show you the top five tools for testing, explain important performance metrics, highlight common speed issues, and share tips to make your website faster. In short, this article covers all the information that can help you test and improve your site.

 

Once you finish reading, you'll be able to make your website faster and more efficient ⚡. So let's get started.

 

 

 

 

Why is Website Speed Important?


Imagine you are browsing for something on the internet, and a website takes so much time to open. To be sure, in this fast world, you will most likely feel frustrated and switch to another faster site immediately. Patience is not recognized in the internet society, and a slow-loading site can drive them away before they even see what you have to offer. The saying "First impressions are the last impressions" definitely applies here.

 

As technology advances, people grow more demanding, with high expectations for speed, whether they're on a desktop or mobile device. Mobile users, who often have poor internet connection speed, still demand even better page loading speeds. If your site is not optimized in terms of speed on mobile devices, you risk losing visitors.

 

You should know that site speed is very crucial for mobile devices, and in 2017, Google posted an image that revealed this.

 

How to Check Website Speed - Key Metrics, Tools, and Optimization Tips

 

Google search engines consider page load time as a ranking factor. Since the start, Google has made many updates and changes to its search engine algorithms. Among the various factors crucial to SEO, page speed has become particularly important, especially with the shift to mobile-first indexing. If your site loads fast, search engines will rank your site higher, leading to increased traffic from organic searches.

 

In short, website speed is important for:

 

  • Creating a Good Reputation
  • Maintaining a Positive Brand Image
  • Supporting Business Growth
  • Improving SEO
  • Improving User Experience
  • Reducing Bounce Rates and Increasing Conversion Rates

 

Alright, I hope you understand why website speed is important. Now, let’s find out how to check a website’s speed and performance level.

 

 

Top 5 Free Website Speed Testing Tools

 

 

How to Check Website Speed - Key Metrics, Tools, and Optimization Tips


There are several free tools available that anyone can use to check their site. Here are the top 5 free website speed testing tools to help you analyze your site and identify areas for improvement.

 

1. Google PageSpeed Insights

 

When it comes to website speed measurement, Google PageSpeed Insights is one of the most widely used tools. It gives the performance score of both mobile and desktop versions of your site, and it gives very detailed instructions on how to make changes according to Google standards. Additionally, it features impressive insights into the real-world experience of your users.

 

It offers various measures like Page Load Time, TTFB, FCP, LCP, CLS, TBT, and more.

 

To use this tool, go to Google PageSpeed Insights -> enter your website URL in the search box -> click on "Analyse".


2. Lighthouse

 

Lighthouse provides specific score breakdowns and recommendations for improving performance and can be used directly in Chrome DevTools or as a browser extension.

 

It offers various measures like Page Load TimeTTFBFCPLCPCLSTBT, and more.

 

To use this, open your website in Google Chrome -> right-click and select “Inspect” -> go to the "Lighthouse" tab -> click on "Analyze page load".

 

3. WebPageTest

 

WebPageTest is an effective tool that enables web page loading testing from various geographic locations. It has advanced options under testing, such as seeing a video of the page loading and viewing a waterfall chart.

 

It offers various measures like Page Load TimeTTFBFCPLCPSpeed Index, Visually Complete, and more.

 

To use this tool, go to WebPageTest site  -> enter your website URL -> select a test location and browser -> click on "Start Test".

 

4. GTmetrix

 

The performance overview by GTmetrix is more comprehensive because it has a list of factors that might be causing your site to be slow. It also measures the speed of your website in the past and suggests ways through which you can enhance the site’s speed further effectively.

 

It offers various measures like Page Load TimeTTFBFCPLCPCLSTBT, and more. 

 

To use this tool, go to the GTmetrix site -> enter your URL in the field provided -> click on "Analyse". 


5. Uptrends

 

Uptrends lets you test your website's speed from various global locations, with a focus on mobile optimization. It offers the current performance measurements and recommendations on how performance can be enhanced.

 

It offers various measures like Page Load TimeTTFBFCPLCP, and more.

 

To use this tool, go to the Uptrends site -> enter your URL and select the locations from which you want to test -> click on "Start Test".

 

Alright! Till now, I hope you have a clear understanding of website speed testing tools and how to use them effectively. But you might be wondering about what performance metrics like TTFB, FCP, LCP, and others actually mean. I'll describe all of them in detail below. Let’s dive in!

 

 

Key Metrics for Measuring Website Speed

How to Check Website Speed - Key Metrics, Tools, and Optimization Tips

 

Key metrics for measuring website speed are important indicators that provide insights into how fast your website loads and responds to user interactions. It's important to understand all key metrics so you will know what to expect when you are using website speed testing tools.

 

Page Load Time: Page load time is how long it takes for a web page to fully load and become usable in a browser. This includes images, scripts, HMTL, CSS, fonts, and every other resource that is used in the loading process.

 

Time to First Byte (TTFB): TTFB measures how long it takes for the browser to receive the first byte of data from the server after requesting a web page. This reflects how quickly the server responds and the delay in the network connection.

 

First Contentful Paint (FCP): FCP means the time it takes for the first item (text, image, etc. ) to be shown when the page begins to load. It indicates how quickly users can observe relevant content.  

 

Interaction to Next Paint (INP): INP measures the time between a user interaction (like clicking a button) and the browser's next rendering of content. This metric measures the time your website takes to respond to user input.

 

Largest Contentful Paint (LCP): LCP tracks how long it takes for the largest visible content (such as a large image or video) to fully load and appear on the screen. This shows when the main content of the page is available to users.

 

 

Cumulative Layout Shift (CLS): CLS measures how much the layout of the page moves around while it’s loading. A high CLS can lead to a poor user experience as content moves unexpectedly, which can be frustrating, especially on mobile devices.

 

Time to Interactive (TTI): TTI measures how long it takes for a page to become fully interactive after loading. A high TTI may cause users to wait more time until they can interact with the page and can be annoying in case they need to perform some action quickly.

 

Total Blocking Time (TBT): TBT measures how long a web page is blocked from responding to user interactions due to background tasks like JavaScript execution. High TBT means the page takes longer to become interactive, which can delay user actions like clicking buttons or links. 

 

Speed Index: Speed Index measures how quickly the content on a page is visually displayed as it loads. In contrast to other measures, such as FCP or LCP, which only record certain time periods of the loading process, the Speed Index provides an overall picture of how quickly visitors feel the page is functional.


We have created a table that will display scores for various metrics and show what’s good, needs improvement, or is poor, to help you easily understand and enhance your website’s speed and UX.

 

 

Metrics performance Good Needs Improvement Poor
Page Load Time 0 - 3s 3s - 5s over 5s
Time to First Byte (TTFB) 0 - 800ms 800ms - 1800ms over 1800ms
First Contentful Paint (FCP) 0 - 1800ms 1800ms - 3000ms over 3000ms
Interaction to Next Paint (INP) 0 - 200ms 200ms - 500ms over 500ms
Largest Contentful Paint (LCP) 0 - 2500ms 2500ms - 4000ms  over 4000ms
Cumulative Layout Shift (CLS) 0 - 0.1 0.1 - 0.25 over 0.25
Time to Interactive (TTI) 0 - 3s 3s - 6 over 6s
Total Blocking Time (TBT) 0 - 200ms 200ms - 600ms over 600ms
Speed Index 0 - 1.3s 1.3s - 2.5s over 2.5

 

Important: The CLS score is not measured in seconds or milliseconds. It is a unitless value that quantifies the amount of unexpected layout shifts during the page's lifetime. So, 0.1 means the page has a minimal amount of layout shift, not related to time.

 

These all metrics highlight specific areas where you need to improve performance. Understanding each of these metrics will make it possible to analyze results obtained from various speed testing tools. Constantly checking and monitoring ensure optimal performance, enhance user experience, and boost search engine rankings. In a way, it helps to implement strategies that would catch problems early before they balloon into something much bigger.

 

It's best practice to cross-check your site’s performance using various tools or methods. For example, after using any performance tool, you can utilize the browser load event to understand when your page has fully loaded, providing an additional perspective on performance.

 

Browser Load Event:

 

This approach can be a bit tricky for beginners compared to the tools mentioned above. Nevertheless, it is useful to know it because, on rare occasions, performance tools may return values that are slightly different due to various factors.

 

The browser load event measures the time it takes for the browser to download all the elements on the page including the images, scripts, stylesheets, etc. Although it depicts that the page has fully loaded, it may not be functional yet.

 

To check the browser load event, open your site and press Ctrl + Shift + I (Windows) or Cmd + Option + I (Mac) to access DevTools. Next, go to the "Performance" tab, click the record button in the top left corner, and refresh the page. Once it fully loads, stop recording. The timeline will show a vertical "Load" line, marking when all resources were fully loaded, giving you the total page load time.

 

Whenever you’re reviewing your site metrics, whether using tools or the browser load event, and come across unfamiliar terms, keep the following basic guidelines in mind.

 

  • If your site performs well, it will show a green circle ✅
  • If there are issues, it will be indicated by an amber informational square 🟧
  • If the performance is poor, it will be marked with a red warning triangle ⚠️

 

If your site performs well, no changes are needed. However, if it shows an amber informational square, improvements are necessary. A red warning triangle means you must make changes to your site.

 

First, let's analyze the common issues that could be affecting our site. Once we are aware of these issues, our site can be optimized to get the green circle scores on all the metrics.

 

 

Common Issues Affecting Website Speed

 

There are many things that can slow down your site. Server response time is very important; if the server is slow, it can affect how fast your site loads. Media files like images, videos, and others, must be optimized because uncompressed files will negatively impact the speed of the page load. Other common issues include:

 

  • Excessive HTTP requests
  • Unoptimized HTML, CSS, and JS code
  • Render-blocking resources
  • Lack of caching
  • Too many redirects
  • Poor mobile experience
  • Absence of a Content Delivery Network (CDN)
  • Ineffective browser caching settings
  • Third-party scripts and ads causing delays

 

Browser caching enhances repeat visit performance by caching previously requested resources, although improper settings can cause an impact on the website speed. If your site is not optimized properly as needed, it will suffer, so solving these issues is important to ensure a fast-running site.

 

So, let's understand how we can optimize our site to improve website speed and performance.

 

 

Optimization Tips for Improving Website Speed

 

How to Check Website Speed - Key Metrics, Tools, and Optimization Tips

 

Optimizing speed can reduce the strain on server resources, which may lower long-term maintenance and operational costs. To ensure your website works optimally, then you should apply various optimization techniques.

 

Here are some actionable tips that cover both simple and advanced techniques to improve the speed of your site.

 

Choose the Right Web Hosting 🖥️

 

When you select the web hosting, it is essential to choose the suitable one for your site. A good web host provides fast server response, reliable uptime, and sufficient capacity to support your site’s traffic. If you have a small website, you can go for shared hosting to get the foundation for speed and stability, and if you have large sites, then you require dedicated servers for high traffic.

 

Improve Server Response Time ⏱️

 

To improve server response time, optimize your server settings, use a CDN, and implement caching. Choose a reliable hosting provider and compress website files. Regularly clean and optimize your database. These things help your server respond faster, so your site becomes faster.

 

Implement Browser Caching 🗃️

 

Using browser caching is another way of improving the speed of your website where resources like images, CSS, and JavaScript files can be cached in a user’s device. This helps the browser to load these files in the local cache instead of loading them over and over from the server.

 

Use a Content Delivery Network (CDN) 🌐

 

A CDN makes your website more efficient and reliable by distributing your content across various servers in different locations worldwide. This allows users to access your site’s static assets, like images and scripts, from the nearby server, and this reduces the load times on the server. This way you can enhance server response time.

 

Enable Gzip Compression 🔧

 

Enabling Gzip compression reduces the size of your website’s files, like HTML, CSS, and JavaScript, before sending them to browsers. This leads to faster loading times and less data transfer, making your site faster and more efficient.

 

Image and Media Optimization 🖼️

 

Compressing media files means making the size of images and other media files smaller without lessening their quality. It can be done through methods such as compressing the image size and utilizing the correct file extension, for example, JPEG photos, or PNG graphics.

 

 

Further, consider using responsive images that change with the size of displays and also use lazy loading, so the media and images are only loaded when they become visible on the user’s screen. This way you can enhance website loading speed.

 

Minimize HTTP Requests 🔄

 

Reducing the number of HTTP requests is useful for your website's speed because it decreases the amount of individual files the browser needs to fetch. To do this, merge multiple CSS files into one as well as multiple JS files into one. Use image sprites to consolidate multiple images into one and eliminate unnecessary elements that require separate requests. This means it cuts the total amount of time it takes to load your site and increases its usability, making it faster.

 

Optimize and Minify HTML, CSS, and JavaScript Files ✂️

 

Minifying is a technique of removing unnecessary white spaces, comments, and line breaks from HTML, CSS, and JavaScript code. This makes the files smaller and easier for the browser to read and process quickly. There are several tools for modification, including HTMLMinifier for HTML and other minifiers for CSS and JavaScript.

 

Render-Blocking Resources 🛑

 

Render-blocking resources refer to files, like CSS or JavaScript, that force the browser to wait until the resource is fully loaded before displaying the page. To speed up your site, minimize and combine these files, and use the defer or async attributes for the JavaScript.

 

  • defer: Use this for scripts that should execute in order after the HTML is fully loaded.
  • async: Use this for scripts that can load and execute as soon as they are available, without waiting for HTML.


As you implement these techniques, you definitely feel your site loads faster, and the user experience will improve.

 

Optimize Mobile Performance 📱

 

In today's time, many users are using their mobile devices, so it's important to optimize your site for it. Make your site properly responsive so your site will stretch across mobile, tablet, laptop, and large-screen devices. Improve usability on smaller screens with mobile-friendly navigation and touch-friendly elements. Regularly test your site across various devices and network conditions to ensure it performs well on all mobile platforms.

 

Prioritize Critical Content 📈

 

The main content should be loaded first and use techniques like critical CSS to ensure that above-the-fold content loads faster. This approach optimizes the time taken by users to view and use other sections of your page, enhancing the user experience and flow.

 

/* critical.css - for above-the-fold content */

body { margin: 0; font-family: Arial, sans-serif; }

.header { background: #333; color: #fff; padding: 10px; }

.main { padding: 20px; }

/* Add more critical CSS rules as needed */

 

Addressing Ads Load Time ⌛

 

Ads can slow down your site because they require extra loading time. Use asynchronous loading so ads don’t block your page from showing. Also, implement lazy loading to only load ads when they’re visible on the screen. Regularly check how ads affect your site’s speed with performance tools. It makes your site faster and more effective, even with many ads.

 

Applying all these optimization tips makes the site perform well, and you will see better metrics scores.

 

To sustain success, some other tips are desirable, as follows:

 

  • Regular Speed Tests and Performance Audits: You should review your site at least once a month or after any updates and make improvements as needed.
  • Stay Updated with Web Standards: Stay updated with the latest web standards and optimization techniques to ensure your site remains efficient.
  • Adapt to Changes: Update your strategies based on changing user behaviors and new technology.
  • Optimize New Code: Regularly review and clean up new code to keep your site running smoothly.
  • Enhance User Experience: Focus on good navigation, accessibility, and overall design for a positive user experience.

 

I hope by now you have a solid understanding of website speed like, how to test, problems that are affecting our site, and how we can optimize that problem.


Let's look at a real example from a few years ago, where some websites took a long time to load. We'll see what's happening in those cases, and then, after optimizing the site, we'll see the impact. It will make you realize how precious every millisecond is.

 

 

Case Studies or Real-world Examples

 

Website speed optimization affects the results of business outcomes directly. Here are three real-world examples that make it clear that a fast website matters.

 

According to the largest retailer site– Amazon, a 100-millisecond delay in page loading reduces sales by 1%. Nevertheless, for a company that produces billions of dollars, this slight repeal means millions of dollars in lost opportunities.

 

Walmart found that every 1-second improvement in page load time boosted conversion rates by 2%. They made improvements to their site’s speed by utilizing methods such as image compression, modification, and many more to boost the engagement of users and sales.

 

The BBC discovered that for every additional second of load time, they lost about 10% of their users. This highlights the critical need for reducing load times to retain audience attention, especially in competitive industries like digital media.

 

Based on these case studies, the following are some important lessons every developer should be aware of.

 

  • Milliseconds Matter: The market leader Amazon proved that even small delays negatively affected sales and user engagement. Tweak minor performance for a better outcome.
  • Conversion Boost: Walmart proved that faster websites lead to higher conversions, making speed optimization key for growth.
  • Audience Retention: The BBC found that faster load times are essential for keeping users, especially in competitive industries.

 

These case studies underscore the importance of website speed across various industries. Whether it's boosting sales, increasing user engagement, or improving SEO rankings, faster load times yield tangible benefits. Optimizing your website speed not only enhances the user experience but also contributes to your overall business success.

 

 

Conclusion 

 

Website speed optimization is more of a continuous process, and it will need consistent problem-solving and analysis 🧠. Following the steps outlined in "How to Test Your Website Speed: Metrics, Tools, and Optimization Tips," along with using reliable tools to measure load times and effective optimization strategies, you can significantly enhance user experience, boost conversion rates 📈, and boost your search engine rankings 🚀. Keep in mind that a website’s speed does not only mean happy faces—it would translate to the success of your online business 🌟.

 

Making your website fast is really important ⚡. In this article, we learned why speed matters, tools to check how well your site performs 🛠️, key metrics to measure its speed, common issues that can slow it down ⚠️, and tips to improve speed. We also looked at case studies for examples 📚. Follow the advice in this article, check how your site is doing, and keep improving to stay competitive online 🏆.

 

Here's What You Need to Remember:

 

  • If you want accurate results, you should use multiple speed testing tools since each can offer different insights 🔍.
  • Test from different server locations to understand how your site performs globally 🌍.
  • Use Google Analytics to track real user experiences and get a clear understanding of your site’s performance 📈.

 

Are you ready to increase the loading speed of your website? Don’t wait any longer, start testing and improving now! 🚀✨

 

 

F&Qs

 

Q1. Why is the website going too slow?

 

Ans: A website can slow down due to the large images, many plugins, unoptimized code, or poor performance of the server. Heavy traffic, old software installation, and not applying caching strategies can also be reasons for the website to slow down.

 

Q2. What is a good website load time?

 

Ans: A good website load time is generally under 2 seconds. For the best user experience, aim for your pages to load within 1-2 seconds.


Q3. What happens if my website slows down? Does page load time affect SEO?

 

Ans: Visitors are likely to bounce if your website performs slowly. Slow load times also impact your SEO because search engines like Google prioritize fast-loading websites. If your site is slow, then your rating will be low in the search results, and people cannot find your site easily.

 

Q4. Which tools are better for checking website speed?

 

Ans: Most of them provide similar parameters regarding site performance and potential recommendations for enhancements. Google PageSpeed Insights and Lighthouse are very good for detailed analysis and practical suggestions. Furthermore, utilizing GTmetrix and WebPageTest as tools enables one to get enhanced information and historical analysis. If you need to test from more locations around the world or if you want to prioritize mobile testing, Uptrends is also great. All in all, the best tool for you depends on the specific requirements that you have.

 

Q5. How Does Web Hosting Affect Website Speed?

 

Ans: A website's speed is largely determined by its web hosting, If your hosting provider has slow servers or lacks resources, your website can load slowly, even if everything else is optimized. Shared hosting can also slow down your site because multiple websites are using the same server resources. VPS hosting or cloud hosting, on the other hand, offers better performance. A content delivery network (CDN) can also boost speed by distributing content across multiple servers globally.

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Poojan Joshi ( poojanjoshi )

Full Stack JavaScript Developer

Joined On 12 Apr 2024

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