Response Time Testing For Beginners

Response Time Testing measures the time taken for one system node to respond to the request of another. It is time a system takes to reach the specific input until the process is over. 

For example, if you have an API, and you want to know exactly how much time it takes to execute JSON data. Response Time measures the server response of each transaction or query.

Response time starts when a user sends the request and ends when the application states that the write has completed.

How to Measure Response Time?

  • Method for calculating metrics collected by each tool
  • Tools Simulate the load and capture speed, which can make a difference in the response time
  • Extra items recorded when monitoring user loads
  • Computing metrics collected by each device increases the response time due to high resource consumption.
  • The architecture of the two devices may be different

Types of Response Metrics

  1. Average Response Time

It is the average time taken for each round trip request. The Average Response Time includes the loading time of CSS, HTML,  XML, images, JavaScript files, etc. Therefore, the average is affected when slow components are present in the system.

  1. Peak Response Time

It helps you to find complex components. It allows you to see the irregularities on the system where a certain request is not handled appropriately. For example, there might be a huge database query executed, which affects the response time. This query does not permit the page to load at the desired time.

  1. Error Rate

It is a mathematical calculation that displays the percentage of problem requests against all requests. This percentage counts all HTTP status codes showing an error on the server. It also depends on recommendations, which are time out.

Response Time Values

0.1 Second

It is the most favored response time. If this response time is 0.1, users always feel that the application responds instantly and does not feel any interruption.

1.0 Second

It is defined as the max limit of response time. Users do not want any interruption, though they may experience some delay. The response time of more than one second may interrupt the user experience.

10 Seconds

It is the max limit, after which response time goes beyond the acceptable limit. However, if response time exceeds 6 seconds, the user will leave that site or quit the application.

Usually response time should be as fast as possible in the interval of 0.1 – 1 second. However, people can adapt to slower response times, but they will never be happy with a response time greater than 2 seconds. The lesser the response times, the better is client satisfaction, lesser costs, higher customer satisfaction.

Response Time Testing Tools

Apache JMeter

JMeter is an automation testing tool which performs load test, functional test, regression test, on different technologies. It supports various types of applications, protocols, and servers like  SOAP, TCP, FTP. SOAP, LDAP MOM, shell scripts, Mail Protocols, Java objects, database.

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  • It is open-source software.
  • Interactive and straightforward GUI.
  • It is highly protractile.
  • The test plans are stored in XML format.
  • It is platform-independent.
  • Best API automation tool.


It is free to use.


LoadRunner is a  solution for Performance Testing by Hewlett-Packard (HP). It is one of the best-automated tools for Performance Testing and has occupied almost 50 percent of the market share. Loadrunner simulates hundreds of virtual users into your application, monitor different performance metrics, and isolate another client and server bottlenecks.

response time testing


  • Cloud Testing.
  • Root Cause Analytics.
  • Supports a Wide Range of Apps.
  • Continuous Testing.
  • Mobile Testing.
  • Interactive User Transaction Simulation.


  • VIRTUAL USER DAYS-$0.56/virtual user day
  • ENTERPRISE EDITION-Contact vendor

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