Performance Testing Tools

What is Performance Testing?

Popularly known as “Perf Testing”, Performance Testing is a subset of performance engineering. It is a type of testing that is executed to ensure that the performance of a software application is suitable and perfect under the expected workload. It is the process of determining the speed, effectiveness, reliability, scalability, and other important features and elements of the system. Moreover, performance testing can be used to compare two or more applications to compare their system speed, data transfer rate, bandwidth, efficiency and reliability.

During the process of performance testing, the system is tested under a mixture of load conditions, where the required response time is tested by the system under varying workloads. Furthermore, software performance testing involves the testing of application under test to ensure that application is working as expected under variety of load conditions. The goal of performance testing is not only find the bugs in the system but also to eliminate the performance bottlenecks from the system.

Types Of Performance Testing

Excellent performance and unique features are two elements of a software application that attract users and new customers. However, to ensure this brilliance and exceptional performance of a software system, software engineers use a variety of performance testing techniques. All these types of performance tests cater to various testing requirements of the developer, tester, and the client, while making sure that each and every phase of the software development process is tested properly. Moreover, with the assistance of these tests one can monitor, detect and resolve all the defects in a software and validate its quality.

  • Load Testing: It checks whether the application has the ability to perform under anticipated user loads. The main objective of this type of performance testing is to identify performance bottlenecks before the software application goes live.
  • Stress Testing: Here the application is tested under extreme workloads to check whether it can handle high traffic or data processing. The objective is to identify breaking point of an application.
  • Endurance Testing: This type of testing is done to make sure the software can handle the expected load over a long period of time.
  • Spike Testing: Tests the software's reaction to sudden large spikes in the load, which is generated by end users.
  • Volume Testing: Under Volume Testing large number of data is populated in database and the overall software system's behaviour is monitored. The main goal here is to check software application's performance under varying database volumes.
  • Scalability Testing:Scalability testing is executed to determine the software’s and application's effectiveness in "scaling up", which supports an increase in the user load. Moreover, it helps testers in planning the capacity addition to their software system.

Why is Performance Testing Important?

The importance of a well performing application and system is immensely high in the software industry. A well performing application lets the end users carry out a variety of given tasks without any unwarranted delay or irritation. Additionally, with an application that has excellent performance, one can easily browse a website and find whatever they are looking for without experiencing several issues and difficulties. It is only through performance testing that these elements and features of a software are validated and maintained, which further improves the performance of the application as well as its functionality, effectiveness and quality. Other reasons that make performance testing important are as follows:

  1. Page Speed: Performance testing ensures that the speed of an application, software or a web page is as per the requirements of the user. It makes sure that anyone can access and load a page as quickly as possible without facing any complications.
  2. Scalability: It tests the scalability of an application, which increases the number of users that interact with a system.
  3. Stability: By testing software’s stability one can ensure that their software or application runs successfully and works perfectly all the time. Also, it monitors the stability of the application and software before its release and ensures that all bugs and errors are resolved as quickly as possible.

Common Issues In Performance:

The process of performance testing revolves around the quality and effectiveness of application and software’s scalability, speed and stability. Throughout the execution of testing, each of these elements of the software are monitored, which makes sure that the application or the software performs properly. However, while executing performance testing developers and testers come across various issues and discrepancies, which makes the whole process time consuming and difficult. Hence, here is a list of some common issues found during the process of testing the performance of an application.

  • Software has poor response time.
  • It requires long load time.
  • The scalability of the software or application is poor.
  • Has software configuration issues for the web server, load balancers, databases and more.
  • There are operating system limitations.
  • The software that requires performance testing has poor network configuration.
  • It has insufficient hardware resources.

Top Performance Testing Tools:

The process of software testing plays a crucial role in software testing life cycle. It is one such process that ensures that the software functions and performs effectively in a various conditions and under huge load. Performance testing is done to make sure an app runs fast enough to keep a user's attention and interest. Moreover, one can find a vast variety of performance testing tools in the market that cater to all the testing needs of the client and the end user. Below is a comprehensive list of most popular performance testing tools used by software testers to test the performance as well as the quality of a software application.

  1. LoadUI NG Pro: LoadUI NG Pro makes it easy to model real-world loads on users API. It supports REST, SOAP, JMS, MQTT and many other API formats. Moreover, LoadUI’s easy-to-use graphical interface makes it simple for new users to setup load scenarios, and it also provides advanced scripting features for those with more experience. One can access detailed reports and quickly automate their load tests on Jenkins, Bamboo, TFS and other automation frameworks.
  2. WebLOAD: WebLOAD is a load and performance testing tool for web applications. It allows users to perform load and stress testing on any internet application using Ajax, Adobe Flex, .NET, Oracle Forms, HTML5 and many more technologies. With WebLOAD one can generate load from the cloud and on-premises machines. WebLOAD’s strengths are its ease of use with features like DOM-based recording/playback, automatic correlation and JavaScript scripting language.
  3. StresStimulus: StresStimulus targets application scenarios that are difficult to test with other performance testing tools. It automatically fixes playback errors with its proprietary autocorrelation. Another important feature of StresStimulus is that, it records user actions and replays them to emulate variable usage patterns. Furthermore, it monitors load impact on application responsiveness and server infrastructure. In this type of performance testing tool, the result analyser finds hidden concurrency errors, which are left unexposed by functional testing and includes detailed application performance metrics.
  4. AppLoader: AppLoader is a load testing solution designed for business applications. It allows users to test any application by reproducing the same user experience from all access points: Thin, fat clients, and web portals. Moreover, AppLoader allows one to test the entire business flow, including all third-party apps, without adding plugins or writing a single line of code. AppLoader replicates the users’ interactions with the application and gives the testers valuable metrics about the end users’ experience, including screenshots of the failures.


An essential part of software testing life cycle, performance testing is important for the success of a software application. It is a type of software testing, which makes certain that the application is developed as per the customer satisfaction and prevents the risk of product failure. Performance Testing is done to provide stakeholders with information about their application regarding speed, stability and scalability. More importantly, it uncovers what needs to be improved before the product is delivered to the client or for use to the end user. Without Performance Testing, software is likely to suffer from issues such as, running slow while several users use it simultaneously, inconsistencies across different operating systems and poor usability. Performance testing encompasses a wide range of different tests, which enable analysis of various aspects of the system. In short, the purpose of performance testing is to provide its investors and stakeholders a high level of confidence in their web application’s ability to handle large volumes of traffic, prior to the products go live.