En bref : Une expérience utilisateur fluide et rapide est non seulement agréable, mais elle est également cruciale pour le succès d’un site Web ou d’une application, ainsi que pour la bonne réputation d’une entreprise. Ce guide couvre : Qu’est-ce que les tests de performances Web ?, Les métriques de test de performance, Types de tests de performances, L’importance des tests de performance.
A smooth and fast user experience is not only enjoyable, but it is also crucial to the success of a website or app, as well as to a company’s reputation.
That's where web performance testing comes into play.
In this article, we explore the importance of web performance and how to implement a web performance testing tool to ensure that a website or application functions properly under various conditions.
What is Web performance testing?
Web performance testing allows you to evaluate the stability and responsiveness of websites and web applications.
The goal is to ensure that everything loads quickly enough, that the system does not crash, and that its performance does not negatively impact the user experience.
Web performance tests are typically conducted at critical times, such as when introducing a new feature, launching a new version or a new application, and before major events and promotions.
The best way to accurately assess how a website behaves under heavy load in real-world situations is to test it in a production environment.
Performance Testing Metrics
System metrics
- CPU usage: The load on a computer's central processing unit.
- Memory usage: How much memory the system uses during loading.
Network metrics
- Bandwidth: The amount of data that can be transmitted through the network infrastructure in one second.
- Latency (response time): How long it takes for a user's request to trigger a response from the system.
- Throughput: The amount of information that can be processed within a given period of time.
- Requests per second: The number of requests processed by the system.
Functional Reliability Metrics
- Failure rate per campaign: The number of user flows with errors relative to the total number of user flows tested, often expressed as a percentage.
- Average test scenario duration: The average amount of time required to run a single test scenario.
Metrics for UX and conversion (Web Core Vitals)
- Largest Contentful Paint (LCP): Measures loading performance.
- First Input Delay (FID): Measures interactivity and responsiveness.
- Cumulative Layout Shift (CLS): Measures visual stability.
- First Contentful Paint (FCP): Measures perceived loading speed
- Average load time: The average time it takes to load a page.
Types of Performance Tests
Load Test
Load testing is one of the most common types of performance testing.
It determines what the system is capable of under a normal load. There is also a subtype of load testing called “endurance testing,” which is used to verify the system’s long-term performance and the effects of the load.
Scalability Tests
Scalability tests are used to determine the extent to which the system will scale and to identify any potential performance bottlenecks that could negatively impact growth.
Stress Tests
Stress tests are load tests conducted to evaluate a system's maximum capacity by subjecting it to stress until that maximum capacity is reached.
State-of-the-art testing
Spike tests reveal how your system handles sudden spikes in traffic.
Configuration Tests
Configuration tests show how a specific configuration change affects system performance.
The Importance of Performance Testing
Making Informed Decisions
Measuring performance in terms of speed, accuracy, and stability enables developers to make informed decisions about necessary changes and to evaluate performance against internal requirements.
Solve problems proactively
Performance testing creates an ecosystem in which more time is devoted to improving the technology rather than dealing with preexisting problems that could have been avoided.
Problems tend to grow exponentially and are also more costly once the software has already been released to the public.
Performance has a direct impact on several key aspects
A website or application that functions as intended under various circumstances has several beneficial side effects, including on:
User Experience (UX)
Visitors are more likely to leave a slow website, which can lead to an increase in the bounce rate.
Search Engine Optimization (SEO)
Search engines, such as Google, consider website speed as a ranking factor. A faster website ranks higher.
Conversions
Research has shown that nearly half of users expect web and mobile apps to load within 2 seconds.
That's a short amount of time to make a good impression.
Fast-loading websites tend to have higher conversion rates, as users are more likely to make purchases or engage with the site.
A Company's Reputation
A slow website can damage your company's reputation, while a fast website can improve brand perception.
Web Performance Testing: Best Practices
Use a web performance testing tool
Of course, a web performance testing tool is essential for conducting performance tests. This tool simulates real-world usage conditions by measuring the website’s responsiveness and stability under simulated traffic loads, which helps identify bottlenecks and potential performance issues.
Web performancetesting tools also provide detailed metrics and analytics—such as page load times, server response times, and the ability to handle high traffic volumes—which enable developers and system administrators to easily identify areas for improvement.
Select realistic test scenarios
Create test scenarios that reflect how users actually behave on your site.
This may include browsing pages, interacting with forms, or making online purchases, for example.
Monitor server infrastructure
Make sure your servers and network infrastructure are properly configured and scaled to handle the expected traffic load.
This may involve optimizing the database, using effective caching, and distributing the load across multiple servers.
Run web performance tests regularly
Your site's performance may vary over time depending on software updates, increased traffic, and other factors.
Therefore, run performance tests on a regular basis to ensure that your site remains responsive and functions properly over time.
Mr Suricate Web Performance Testing Tool
The automated testing tool Mr Suricate helps you identify potential performance issues to ensure a flawless customer experience under a variety of conditions.
Our no-code SaaS solution covers a wide range of automated tests to give your users the best possible e-commerce experience.
Take control of your applications and detect bugs in real time on your websites, applications and APIs by reproducing your user journeys at regular intervals.