What is the Response Time Testing?

Software TestingAutomation TestingTesting Tools

During a load or stress test, a tester collects various data to assess the performance of an app or website. Every test, however, begins with a request to an application. After a request is issued, the tester estimates how long it will take the app to react to the given request and calculates the app's response time.

Let's look at some real-life instances to better grasp response time.

What is Response Time Testing, and how does it work?

Response Time Testing determines how quickly one system node responds to another's request. It's the amount of time it takes for a system to get to a given input and complete the operation. For example, suppose you have an API and want to know how long it takes to execute it and return JSON data. Every transaction or query's response time is measured by the server.

The response time begins when a user submits a request and ends when the application reports that the request has been finished.

Example in the absence of the Internet

Assume you're at a grocery store's checkout counter. The products are processed by the cashier in three minutes. If there are a large number of customers in line before you, you will have to wait a few minutes before reaching the checkout person.

As a result, the overall response time in this example will be the time it takes to process the products (3 minutes) plus the time it takes to reach the cashier.

Example in the presence of the Internet

Assume you're purchasing groceries from an internet retailer. To finish the payment, simply place your items in the cart, click checkout, and input your information in the car details box.

Now, through the online grocery store, a request will be issued to your bank's server. Once your bank has approved the payment, it will be confirmed. If your bank is processing a large number of requests at the same time, it may take some time for your request to be processed.

The response time is the time it takes for your bank servers to complete your request when you click "pay" after entering your credit card information.

How Do You Calculate Response Time?

We can utilize test tools to measure response time by encircling an essential business process with Start and End transactions. A business process is an activity or a group of activities that users do in an application to execute a business task, such as logging in or purchasing a book on Amazon.com.

The response time for the same process to measure API response time will differ slightly from tool to tool. This is why −

  • Each API response time test tool's method of calculating metrics

  • Tools Simulate the load and capture speed to see how they affect reaction time.

  • When monitoring user loads, there are certainly other items that are recorded.

  • Due to high resource use, computing measurements gathered by each tool increase response time.

  • It's possible that the two tools' architectures aren't the same.

Response Metrics − What Are They and How Do They Work?

Average Response Time

The Average Response Time is the time it takes for each round trip request to be completed. The loading time of HTML, CSS, XML, pictures, JavaScript scripts, and other files are included in the Average Response Time. As a result, when slow components are present in the system, the average is influenced.

Peak Response Time

The Peak Response Time assists us in identifying components that may be troublesome. It assists us in locating all inconsistencies in the website or system where a certain request is not processed correctly. A huge database query, for example, maybe run, affecting the response time. This query prevents the website from loading at the requested time.

Error Rate

The Error Rate is a quantitative statistic that shows the percentage of requests that are problematic compared to all requests. This percentage represents all HTTP status codes that indicate a server error. It also keeps track of requests that have expired.

Three Crucial Response Time Parameters

The two most important characteristics of the Response Time Test are −

  • Average response time.

  • Maximum response time.

It indicates how long a user must wait for the server to respond to their request.

Following are main Response time testing example values

0.1 second

It is the best desirable reaction time. When the response time is 0.1, users have the impression that the application or system is always responding quickly and that they are not being interrupted.

1.0 second

It is defined as the maximum response time that can be tolerated. Users are unlikely to suffer any disruption, though there may be some delay. A response time of moreover one second may cause the user's experience to be disrupted.

10 seconds

It's the point at which reaction time exceeds the acceptable threshold. In today's world, however, if the response time surpasses 6 seconds, the user will abandon the site or close the application.

In general, response times should be as short as feasible, between 0.1 and 1 second. People can adapt to decreased response times, but a response time of more than 2 seconds will never satisfy them. Client satisfaction improves with shorter response times, lower expenses, and improved customer happiness.

Tools for Response Time Testing

There are numerous Response Time Testing tools on the market. The following are three prominent examples of response time testing tools −

  • JMeter − On the target application, Jmeter can be used for load and performance testing.

  • Load Runner − Microfocus created Load Runner, a load testing tool. The LoadRunner response testing tool works by simulating Virtual Users on the application under test.

  • AEM (Adobe Experience Manage) − Another useful tool for testing response time is Adobe Experience Manager or AEM for short. It lets you check for issues with searches, requests, and error messages.

Improvements to the server response time

There are numerous methods for reducing a website's or application's server response time.

Better web hosting platforms are available.

Businesses should invest in a high-performance hosting platform that provides consistent server response times. Avoid free web hosting and web hosting firms that provide poor assistance.

Make use of the Content Delivery Network.

A content delivery network, or CDN, is a network of proxy servers and data centers that are deployed over the internet. The load time is more likely to be slowed when servers are located far away from the intended audience. As a result, companies should choose a server that is closest to their target market.

Databases should be optimized.

Databases are prone to accumulate a large amount of data over time, producing a lag in the server response. Regular database optimization will keep these problems at bay.

PHP should be updated.

PHP can eat up a server's valuable resources by doing unneeded processes. To reduce latency, businesses that use PHP should update their PHP version on a regular basis.

Reduce the amount of the coding

The response rate of a website is mostly determined by its code structure. CSS, JavaScript, and external files can make or ruin a website's performance. Attempt to reduce code size by dispersing JavaScript and CSS files according to their size and importance.


  • The time it takes for one system node to respond to the request of another is referred to as response time.

  • In performance testing, the average response time is the time it takes to complete each round trip request.

  • Peak Response Time assists us in determining which components may be troublesome.

  • The Error Rate is a quantitative statistic that shows the percentage of requests that are incorrect.

  • 0.1 second, 1.0 second, and 10 seconds are three critical response time values.

  • Jmeter, Loadrunner, and AEM are the three most commonly used response time testing tools.

  • There are five ways to improve server response time, i.e., Better web hosting platforms are available, Make use of the Content Delivery Network, Databases should be optimized, PHP should be updated, and Reduce the amount of the coding

Updated on 24-Sep-2021 08:42:23