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What is Load Testing? Definition, Types, and Examples

Automated tests can be repeatedly run after every code change with minimal user interaction. Automated testing can often catch issues before end users experience a problem, because automated tests are running consistently. Testing should be used during the development of web apps, during quality assurance, after new releases, prior to new product releases and marketing initiatives, and pretty much any time something about the system changes. Learn more about the various monitoring tools in the market today by reading our article where we compare the top 15 application monitoring tools. If you have a rough idea of the size and volume of traffic your website should handle, you can set up tests that slowly increase load until you reach that limit. This type of load testing can help you plan for the expected capacity of the website.

load testing definition

Some load testing systems, like LoadView, allow for emulating a connection type for testing. JMeter can generate heavy load on different types of apps, including web apps, web services, and databases queries, among many other protocols. One thing to remember about JMeter is that it operates at the protocol-level only.

Performance testing metrics

Strategizing test plans helps teams follow through the exact necessary tests to get reliable results from the testing activity. The tester consists of a large resistor that has a resistance similar to a car’s starter motor and a meter to read the battery’s output voltage both in the unloaded and loaded state. When the tester is used, the battery’s open circuit voltage is checked first. If the open circuit voltage is below spec (12.6 volts for a fully charged battery), the battery is charged first. When applied, it draws approximately the same current the car’s starter motor would draw during cranking.

A recent survey conducted by Veeam, a global leader in the backup and data management space, with over 1,500 IT professionals found that the cost of one hour of downtime for high priority applications was over $84,000. Performance testing is a type of testing for determining the speed of a computer, network or device. It checks the performance of the components of a system by passing different parameters in different load scenarios. He is skilled in test automation, performance testing, big data, and CI-CD.

Mobile App Load Testing for Multiple Users

If the application becomes unstable while handling multiple requests or extends its response time, it is likely to reach its peak operating capacity. This indicates that performance bottlenecks exist, and they need to be addressed. Load testing is a type of non-functional software testing in which the execution of a software application is judged under a particular load. It controls how the software application works when a large number of people use it at the same time. Prior to deployment, load testing is done to detect performance bottlenecks and guarantee that software programs are stable and run smoothly. Organizations should find testing tools that can best automate their performance testing process.

Tutorials Point is a leading Ed Tech company striving to provide the best learning material on technical and non-technical subjects. When a website receives a lot of traffic, it takes longer for it to load. Performance tests should be conducted once functional testing is completed. We look forward to learning more and consulting you about your product idea or helping you find the right solution for an existing project. Additionally, root-cause analysis can be performed to understand the bottleneck or defect from its origin and thus prevent future errors. An app development team with in-depth knowledge & customer understanding.

Choose your load testing solution

It is a kind of performance testing helping you validate your software product’s behavior under normal and peak conditions. It is the only way to know whether your product can handle the demands of end users or not. In summary, load testing is a vital process to evaluate a system’s performance under various workloads, ensuring that it can meet user demands and maintain a high level of functionality. By following best practices and conducting regular tests, you can optimize the system for both normal and peak load conditions, leading to increased user satisfaction and overall system reliability.

load testing definition

The performance testing life cycle describes the process of arriving at one or more of a series of tests that should be performed for measuring metrics of an application over time. Smoke testing performs low-level background tests, ensuring the system can handle the bare minimum requirements. Smoke testing is often carried out during the initial stages of software development. By identifying errors and defects earlier within the cycle, teams can release the software in a more efficient manner and avoid costly (and time-consuming) last-minute defects. Often, load testing is performed right before the release of a new product, a new campaign, a major event, or a system update.

When do you Use Stress Testing?

This gives developers more time for designing, executing, and analyzing their tests. Load testing helps developers identify issues like system lag, slow page load times, or crashes when different levels of traffic are accessing the application during production rather than post-launch. A load testing example would be a tax preparation company evaluating their web application load performance prior to peak income tax filing season and the traffic spikes it causes. There is not much difference between load testing and stress testing, which is the reason why they are often confused with each other. Specifically, it monitors the response time, scalability, speed, and resource utilization of the software and infrastructure. Load testing is an essential part of modern development and operations as it helps teams build and deploy software with confidence in production environments.

  • The phenomenon reached a peak with the COVID which saw the rise of homeworking and lockdowns, thus accentuating further the already important increase.
  • Even a few seconds of downtime can significantly impact a company’s bottom line.
  • Load testing can be performed on end-to-end software systems or on small components to measure speed, capacity and response time to check for bottlenecks, unstable performance, and maximum operating capacity.
  • For example, if your 70th percentile response time is 200ms, then 70% of transactions took 200ms or less to complete.

It ensures that a system, software, or application can handle the expected user load, and is therefore vital in maintaining the smooth operation of these digital aspects. By simulating real-world user loads and assessing the response of the program, developers can identify and troubleshoot any potential performance issues before they impact users. Furthermore, load testing enhances user satisfaction by providing a seamless and uninterrupted experience. Understanding this load capacity can also inform system maintenance and future scalability plans, serving as a strategic tool for business growth and stability. Load testing is performed to determine a system’s behavior under both normal and anticipated peak load conditions. It helps to identify the maximum operating capacity of an application as well as any bottlenecks and determine which element is causing degradation.


Before creating load test scenarios, the crucial step is to understand the application and its users. Define practical tests that would reflect a real user’s behavior, including the selection of diverse browsers and devices. According to Gartner’s research, the financial loss can reach up to $300,000 per hour on average. Also, we should consider other damage, such as brand reputation and unsatisfied users. Performing load tests frequently helps to save businesses from these risks and protect the brand.

For example, all client-side applications should go through various tests to determine their limits and assist with improving the user experience. If application performance issues go undetected in the production environment, the cost, time, and resources load testing definition involved to have to go back and try to determine where the issues lie can be steep. Load testing is a type of performance testing that mimics multiple users simultaneously trying to access an application or system to examine its performance.

How to Choose a Load Testing Tool

When the load placed on the system is raised beyond normal usage patterns to test the system’s response at unusually high or peak loads, it is known as stress testing. The load is usually so great that error conditions are the expected result, but there is no clear boundary when an activity ceases to be a load test and becomes a stress test. JMeter is an open-source performance testing platform by Apache designed specifically for load testing web applications. JMeter does not work at the browser level, it simply works at the protocol level. While it appears like a browser from the perspective of the web server, it cannot execute all actions a browser could perform, such as actually rendering the page and executing JavaScript. JMeter is good for generating requests on a website from many simultaneous users during load testing.

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