What are Performance Testing and Load Testing?

See How Telerik Test Studio helps in Load Testing

See How Telerik Test Studio helps in Performance Testing


Performance Testing

Performance Testing is being performed to measure smoothness and readiness of the application. While creating an application the vital factors should be kept in mind are as follows

  • Speed of the application at any given condition
  • Response time of the application
  • How much resources being used by the application
  • How stable is the application at given time
  • Throughput of the application
  • For web application times spent in making HTTP calls at server and client etc.

Performance Testing is type of testing that test application on above listed criteria.


Performance Testing measures performance of the application. After measuring performance of the application it sets the base line for further testing. Performance testing is very important since cooperate prestige of the application or decision on the final release of application based on the analysis of the results produced by this test. Performance testing does not find any defect in the application. Often, we perform Performance testing on a stable system.

Performance Test finds performance issue in the

  • Database access
  • Network latency like time spent on the network
  • Time spent on reading or writing files on the disc
  • Time spent on making HTTP calls etc.

So we can summarize Performance testing


Load Testing

Load Testing determines user experience when application is under load. In Load Testing, we test application with maximum number of users or with the expected number of users in the production environment.



Load Testing determines upper limit of the application. Load testing simulates expected number of users from the production environment and tests the application with that number of users. When we exceed number of users to test the application much beyond expected number of users from production environment then we call testing as STRESS TESTING. In majority of the time we consider Stress Testing as Load Testing.

Purpose of Load Testing is to find defect in the application when application is running under maximum load. Some of the defects could be as follows

  • Memory leak
  • Buffer Overflow
  • Server failure
  • Network failure
  • Input devices reading failure
  • Writing on output device failure etc.

We can summarize that Load Testing tests application behavior and sustainability with the maximum number of user inputs.


Setting up environment for Load Testing in Test Studio

In this post we will follow step by step approach to setup environment for Load Testing in Test Studio. Very first go to Program ->Telerik ->Test Execution and open Configure Load Test Services


Next you will get dialog box to configure the services.


In this dialog box you need to make sure that all the services are started and most importantly make sure that you have given correct database instance name in the Reporter Database Connection setting


In above case kumar is the database server name running on my machine. So I provided instance name kumar\sqlexpress. You do not need to create TestStudioReportingDB database manually. Test Studio will create this database in given database server. After making sure all the information is provided correctly click on Ok to restart all the services.

Next open Test Studio and create a test of type Load Test. Very first you will get following screen


Click on Okay and from the ribbon click on Manage


Here you got an option to Add Controller and manage the number of Virtual users. To Add Controller click on Add Controller button


In Add Controller dialog box give the name of the computer or IP of the computer you want to set as controller and click on Test Connection. After successful connection click on the Add button to add a controller


On the successful adding of controller you need to set the number of Virtual Users for the Controller as following. We have added 258 virtual users in this controller


Next we need to set Controller and Reporter. Select the computer from drop down and click on the connect button.


After successful connect you can see green signals beside Controllers, Reporters and Agents.


All three green signals imply that environment for load testing in Test Studio has setup successfully. Now you can go to design and create ass cases to perform Load Testing