An intro to Load Testing – The Process, Tools, Best Practices

Load Testing

What is Load Testing?

Load testing is also termed reliability testing or software performance testing. It is a software testing method where the software or an application is put through an abnormal load to see how it reacts and performs under that condition. It is thoroughly checked if the performance of the application decreases or increases in that situation. The main aim of running a load test is to detect the potholes of an application’s performance and smoothness. This ensures that stability is instilled into that software when multiple users access the same function simultaneously.

The biggest USP of Load Testing is that it helps in giving out a clearer picture of the limitations of the application. Then, enabling enables the tester to analyze the root cause of the problem and take corrective measures. Through load testing, the failures are limited during production, which in return reduces the expenses. Hence, load testing is very cost-effective in nature.

User Experience Under Load Testing

Users perform this test to describe how promptly the device under test (DUT) responds to a certain amount of production load. There are selected applications that go through this test where the performance of the targeted application is denoted as the User Experience Under Load. Finally, the users assess the results to find if the application is performing on point.


Load Testing Tools:

Some of the most popular testing tools are listed below:

● Apache JMeter

● BlazeMeter

● Blitz

● Flood

● Gatling


● LoadRunner

● Load Test

● LoadUI

● Login VSI

● NeoLoad

● OpenSTA

● Rational Performance Tester

● Silk Performer

● Siege

● Test Studio

● Visual Studio


Why is Load Testing Important?

Load testing is a crucial part before an application or software leaves for production. Because there is a certain amount of load that an application is put through after the functional test. However, this doesn’t mean that the same application would go through the same amount of load when the user uses it. Hence, load testing is essential to check for any loopholes or error functions. This ensures correcting the loopholes.

Today, people rely a lot on applications for day-to-day functions and solving critical problems. Hence, they cannot afford the application to break down regularly due to excess load. It can adversely affect the software branding. Thus, load testing ensures the successful and efficient running of the software.


How to Start This Testing?

The basic steps to start the process of this testing are:

● First, gather all the requirements to begin the test. This includes all essential parts, along with all the experience and problems the application’s end-users face.

● Second, follow how the end-users use the application and the amount of load they put on it regularly to analyze the actual journey of the application.

● Third, establish a solid base on which you can specify the conditions and run tests. Whenever you see the specifications are not met, update the process for better test execution.

● Finally, give the ample amount of importance test loading requires and integrate the whole test execution process with all the tools necessary.

Selecting a Load Testing Tool:

Keep in mind the following points before selecting the suitable load testing tools. Hence, check for the following:

● Efficiency and accessibility of the tool before creating test cases.

● Accuracy of the tool by tracking real-time test data.

● Scalability of the tool by regulating the number of test cases or instances.

● Integrity methods of the tool to bring down all tools together.


The benefits are:

● Identifies the loopholes of an application before direct production.

● Increases the scalable functions.

● Optimizes performance to reduce the risks of system downtime.

● Substantially reduces the costs of repairing after failure.

● Increases satisfaction and provides a better end-user experience.

Best Practices

The best practices for load testing are:

●  While carrying out a load test, it is essential to think like a user. This helps incorrectly develop test cases and put an appropriate load on the system for testing.

● The more often you load test your systems, the better it works. On top of that, if you feel that an application or software is not reacting to load well, consider testing it in the early stages before a complete breakdown happens.

● Before starting a full-blown load test, try to analyze all the real-time issues that a system is facing. Create a test case accordingly and then execute all of it. Keeping that in mind, never put on the complete load at once. Instead, consider putting it in installments and recording every stance of the system’s reaction.

Load Testing Guidelines:

Here are the guidelines to conduct the test:

  • Plan the test once the application is stable. 
  • A vast number of data (Unique) should be readily available in the data pool.
  • One should avoid creating detailed logs to conserve the space of disk IO properly. 
  • Avoid downloading images on the site.
  • Decide the number of users for every script and scenario. 


Hence, this testing ensures that your application runs smoothly and effectively, thereby satisfying the experience of an end-user. This ensures a reduction in functional errors and increases the application’s performance exponentially.