The essential for your website in 2026: Web Performance
Web performance", also known as "webperf" or "WPO" for "Web Performance Optimization", plays a crucial role in evaluating and monitoring your website's performance. This terminology, although sometimes ambiguous for beginners, is essential for understanding the technical challenges of the web.
Web performance focuses primarily on technical aspects, such as page load speed and site availability, rather than business metrics like conversions or RPM. However, it is part of a broader approach to digital performance, which aims to measure a website’s overall effectiveness beyond just technical aspects. It is important to note that, although these areas are distinct, they can sometimes be confused.
Monitoring your website’s performance involves a continuous and thorough assessment of technical aspects to ensure an optimal user experience and efficient site operation. This includes optimizing page load speeds, ensuring consistent uptime, and implementing proactive measures to maintain these high standards.
In 2024, mastering web performance is more than just a competitive advantage; it has become an absolute necessity for any effective online presence.
💡 Web performance measures the technical speed of your pages. DEM goes a step further: it monitors the actual user experience throughout their entire journey, even when PageSpeed scores are in the green.
1- Defining web performance
Web performance, often referred to as “webperf,” encompasses all efforts aimed at improving a website’s technical performance. This field, abbreviated as “WPO” (Web Performance Optimization), primarily involves evaluating a site’s performance using specialized tools and then optimizing it to speed up page loading and make navigation smoother. Find out why it’s important to measure web performance.
A high-performance website is defined by its availability and interactivity, offering fast loading times and smooth page navigation. These criteria are essential to the user experience. Strong web performance can positively impact SEO, revenue generation, and even the site’s environmental footprint.
I- SEO optimization
Google incorporates website performance into its organic search algorithm. A website’s loading speed affects how quickly its pages are indexed. Slow loading speeds reduce the number of pages indexed, which impacts the site’s ranking in search results. Slow ad loading also affects search rankings.
II- Improving the user experience
Optimal performance ensures fast access for all users, regardless of their devices, connections, or traffic spikes. Online tools such as simulators, comparison tools, and internal search engines must also function smoothly.
Fast loading times and a pleasant user experience encourage visitors to explore your site. These elements are at the heart of what is known as a seamless digital experience, which is essential for meeting the expectations of modern users.
For e-commerce sites, loading speed is crucial; 67% of shopping cart abandonment is attributed to slow site speed. A satisfying user experience promotes customer loyalty.
III- SXO enhancement
SXO (Search Xperience Optimization) combines SEO and UX (User Experience). It improves SEO by optimizing the user experience. In addition to website performance, other SEO criteria—such as content optimization and internal/external linking—must meet user expectations.
IV-Decreasing the ecological footprint
A website consumes resources for every visitor. Slower loading times result in higher energy consumption. Improving a website’s performance reduces its environmental impact.
V- Optimizing sales
The overall performance of an e-commerce site influences its sales. A fast site reduces the abandonment rate and increases the conversion rate, key factors in revenue.
These technical performances also have a direct impact on customer satisfaction indicators, which enable the real perception of users to be assessed.
VII - Decline in rebound rate
A high bounce rate means that visitors leave the site without interacting with it. Strong website performance improves this rate, boosting the conversion rate.
VIII- To increase session length
Visitors who stay longer increase the likelihood of conversion. A positive user experience and an effective SXO strategy are crucial to achieving this.
2- Web performance components
In any technical field, performance indicators are essential for evaluating sites or monitoring their evolution. In the same way that the automotive industry evaluates a car's performance in terms of torque, horsepower, top speed or time to reach 0-100 km/h, there are many ways to measure the performance of a web page. There are many aspects to consider in order to guarantee the effectiveness of your website.
Web performance focuses primarily on page loading speed, but it also incorporates elements such as SEO, ease of site navigation, and much more. Here are a few key points to consider:
- Technical aspects: Is your site secured in HTTPS? Does it include structured data? Is it optimized for mobile browsing with an AMP version?
- Content: Is your content effective in terms of bounce rate, average visit duration and click-through rate? How has traffic to your site evolved in recent months?
- SEO: Is your content properly optimized for search engines? How many keywords are positioned?
These questions provide a general overview of your site's evaluation. Every optimization, no matter how small, contributes to improving your site's performance. By accumulating these improvements, you'll soon see significant results!
3- Web performance tools
There are many tools designed to evaluate website performance. Some are free, others require a fee, but most offer both free and paid versions with limitations on features and testing volumes. They all provide data on standard metrics and Web Vitals. What sets them apart is their ability to provide relevant recommendations based on up-to-date benchmarks. Here is a selection of the most popular ones, though there are other valid options available.
PageSpeed Insights
Often mistakenly believed to be the primary factor Google considers in its algorithm, it provides basic recommendations for improving the average score on a scale of 100.
Lighthouse
This key Google tool is accessible via the Chrome browser's developer tools using an extension. It provides recommendations similar to PageSpeed Insights while including sections dedicated to accessibility, SEO, and apps.
Uptrends
A cloud-based website monitoring tool for professionals and businesses, it monitors servers and websites. Easy to use, its dashboard allows you to track website performance in real time and sends immediate alerts in the event of issues, making it easier to resolve them. It allows you to notify team members via SMS, phone calls, push notifications, or a dedicated app.
K6 load testing
K6 enables you to test website performance. This SaaS and open-source tool supports both local and online testing, catering to software developers and testers, with over 30 integrations for maximum flexibility.
Web Page test
This developer-focused platform evaluates website performance. It allows users to run performance tests from different geographic locations to simulate user locations.
Image Analysis Tool from Cloudinary
This tool analyzes a website's images to measure their performance. It allows you to modify the images to optimize the site's loading speed.
Chrome DevTools
Integrated into the Chrome browser, Chrome DevTools is a set of tools for web developers. It includes features such as responsive testing, image and script loading monitoring, and an error detection console.
4- What are the most relevant indicators?
Certain metrics are essential in the field of web performance. TTFB (Time to First Byte), for example, measures the time it takes for a complete request to be processed between the browser and the server hosting the site. Easy to calculate, it identifies hosting-related issues such as distance from the data center, undersized processor or memory, lack of caching, incorrect SQL configuration, etc.
Speed Index : Perceived speed
Another key metric is the Speed Index, which measures the time it takes for the visible portion of the page (the viewport) to fully load. Capturing this data via video, though complex and costly, is crucial for this assessment. This metric is not always available in all measurement tools and can vary significantly depending on the tool used.
What are Core Web Vitals?
In 2020, Google launched “Core Web Vitals,” a set of metrics comprising three key metrics that have since become the industry standard. Each metric is designed to assess a specific aspect of a web page’s performance. Together, they provide a comprehensive view of a page’s performance—or even an entire site’s performance when viewed collectively, as in Google’s original reports. Learn more about the three metrics.
LCP
“Largest Contentful Paint (LCP)”: measures the time it takes to display the main, visible element of the page. This is often an image, headings, or blocks of text. A good LCP should be less than 2.5 seconds and never exceed 4 seconds.
FID
“First Input Delay”: measures the time it takes for a page to become fully responsive. It is heavily influenced by JavaScript, particularly third-party scripts. To be considered good, it must be less than 100 milliseconds. Above 300 milliseconds, it is considered poor.
CLS
“Cumulative Layout Shift”: measures the stability of page elements during loading. No visual vertical or horizontal shifts should occur. It has no specific units, and to be considered good, it must be less than 0.1, without exceeding 0.25.
The other three “Web Vitals” metrics include FCP (First Contentful Paint), which measures the time it takes for the first visible element of the page to load; TTI (Time to Interactive), which measures the time it takes for a page to become interactive for the user; and the Speed Index, which was mentioned earlier.
Real User Monitoring (RUM) tools
SaaS-based RUM tools are not as widespread, mainly because they require an initial deployment to start collecting data, and using them involves significant costs that are reflected in subscription fees. However, Google is a notable exception, offering one of the most comprehensive databases on web performance for free: the Chrome User Experience Report, or CrUX. It is sometimes called the Chrome User Experience Report, although this name is rarely used.
5- How can you optimize your website's performance?
Web performance, like accessibility, SEO and security, is an essential technical element right from the start of a website's creation. To guarantee fast loading, it's essential to integrate this dimension right from the design stage.
Technical choices, such as framework selection, SSR solutions or server architecture, must be adapted to meet performance objectives, whether in terms of page weight or other indicators (FCP, Speed Index, Blocking Time...).
Web performance is still rarely taken into account, even by well-known agencies, and many websites are deployed without any real attention to this aspect. Optimizing web performance after the fact is often a challenge, especially for teams unfamiliar with the field.
One solution is to call in the experts to carry out a performance audit or optimization. Use this type of service, benefiting from tools and methodologies refined over the years.
Optimizations often follow Pareto's law, with 80% standard actions and 20% specific, adapted to the technical choices of each customer. It is in the latter segment that our expertise brings maximum added value, sometimes enabling ambitious objectives to be achieved.
Another preferred approach is to train front-end developers in advance. By familiarizing them with free resources such as videos, articles or repositories like Web.dev, take advantage of best practices to improve performance.
This approach needs to be complemented by constant monitoring, given the rapidly evolving technical environment: CSS, HTML and JavaScript standards, web browsers, frameworks, tools, SaaS solutions, etc.
This method is ideal for instilling a performance culture within technical teams and across the board, involving business, marketing and UX/UI.
Each of these profiles plays a role in optimizing page speed, whether through development, choice of third-party tools or interface and tool design.
6- The 2Be-FFICIENT approach to web performance
With 2Be-FFICIENT :
- Monitor key performance indicators in real time to ensure your website is running smoothly.
- Quickly identify issues that could negatively impact the user experience.
- Anticipate issues before they affect your users.
- Take advantage of an impartial third party to hold your partners accountable and ensure a higher quality of service.
