Performance testing is a type of non-functional testing that measures how web applications, web pages, or frameworks respond when tested against various load levels to see how they act and respond when under load for certain periods of time. In this article we’ll set out to explain how to use Selenium and its family of tools, to carry out performance tests. While it’s not recommended to use just Selenium and WebDriver for carrying out load tests, this article will explain the process of setting up a load test with Selenium, as well as cover the advantages of a solution like LoadView.


What is Selenium WebDriver?

Selenium WebDriver is utilized to automate web application testing to check that it fills in true to form. It supports numerous browsers, for example, Firefox, Chrome, Internet Explorer, and Safari. In any case, utilizing WebDriver, we can automate testing for web applications as it were. It doesn’t fit the bill for Windows-based applications. It likewise bolsters diverse programming dialects, for example, C#, Java, Perl, PHP and Ruby for composing test contents. Selenium WebDriver is stage free since a similar code can be utilized on various operating systems like Windows, iOS, Linux and Ubuntu. It is one of the segments of the Selenium family, which additionally incorporates Selenium IDE, Selenium Client API, Selenium Remote Control and Selenium Grid.

Selenium WebDriver doesn’t deal with Windows, yet this constraint can be overwhelmed by utilizing third-party instruments, for example, AutoIT, Sikuli, and others. It has diverse area procedures too, for example, ID, Name, Link text, Partial Connection Text, Class Name, CSS Selector and Xpath. It likewise has better support for dynamic pages like AJAX, where components of the page may change without the page itself being reloaded. By utilizing diverse container documents, we can likewise test APIs, databases, and so on utilizing Selenium WebDriver.


Selenium WebDriver Architecture

Selenium WebDriver API gives correspondence facility between languages and browsers.  The accompanying picture shows the compositional portrayal of Selenium WebDriver.

There are four fundamental parts of WebDriver Architecture:

  • Selenium Language Bindings
  • JSON Wire Protocol
  • Program Drivers
  • Genuine Browsers

Selenium Architecture


Selenium Language Bindings

Selenium load testers have made language bindings/Selenium Client Libraries so as to help numerous dialects. For example, on the off-chance that you need to utilize the program driver in Java, utilize the Java build. All the upheld language bindings can be downloaded from the official Selenium site.  The quantity of Selenium clients has developed fundamentally after some time. Numerous clients imply numerous improvement stacks to be upheld, and network documentation to utilize Selenium with various dialects, utilizing WebDriver API as the principal usefulness to be shared by means of binding.


JSON Wire Protocol

JSON (JavaScript Object Notation) is an open norm for trading information on the web. It underpins information structures like article and exhibit. In this way, it is anything but difficult to compose and peruse information from JSON.  JSON Wire Protocol gives a vehicle component to move information between a client and a server. JSON Wire Protocol fills in as an industry standard for different REST web administrations.


Program Drivers

Selenium utilizes drivers, explicit to every program so as to build up a protected association with the program without uncovering the interior rationale of program’s usefulness. The program driver is likewise explicit to the language utilized for automation, for example, Java, C#, and so on.  At the point when we execute a test content utilizing WebDriver, the accompanying activities are performed inside.

  • HTTP demand is created and sent to the program driver for every Selenium order.
  • The driver gets the HTTP demand through HTTP worker.
  • HTTP Server chooses all the means to perform guidelines which are executed on program.
  • Execution status is sent back to HTTP Server which is hence sent back to automated content.


Genuine Browsers

Browsers supported by Selenium WebDriver include the following:

  • Internet Explorer
  • Mozilla Firefox
  • Google Chrome
  • Safari


Features of Selenium WebDriver


Different Browser Support

Selenium WebDriver upholds a various scope of internet browsers, for example, Firefox, Chrome, Internet Explorer, Opera and some more. It likewise underpins a portion of the non-regular or uncommon programs like HTMLUnit. HTMLUnit is a headless browser, or a browser that doesn’t use a GUI (Graphical User Interface). Many open-source load testing solutions use headless browsers, as performance testers can initiate a lot of HTTP, or protocol-based traffic. The issue, however, with headless browsers is that they can’t test client-side scripts, so the actual performance from the user’s perspective is missed.

Protocol-based Tests vs. Real Browser-based Tests

Protocol-based tests were very popular during the early years of the Internet. However, over time, web application frameworks and browsers evolved, and now those once popular load testing methods have become increasingly outdated. While HTTP tests are still used today, it makes load testing difficult as websites become more complex.

Modern day web applications rely on client-side behavior and actions, rather than the server for navigation, searches, etc. For example, Single-Page Applications (SPAs) rely on little involvement from the server once the page is loaded. There may be some dynamically loaded content from the server-side, but from the user’s perspective, this provides them with a more seamless experience without having to continually load new pages.


Various Languages Support

WebDriver additionally bolsters a large portion of the generally utilized programming dialects like Java, C#, JavaScript, PHP, Ruby, Pearl and Python. Subsequently, the client can pick any of the upheld programming language dependent on their competency and begin constructing the test contents.



WebDriver performs quicker when contrasted with different apparatuses of Selenium Suite. it doesn’t need any middle of the road worker to speak with the program; rather the device straightforwardly speaks with the program.


Basic Commands

Most of the orders utilized in Selenium WebDriver are anything but difficult to actualize. For example, to dispatch a program in WebDriver following orders are utilized:

  • WebDriver driver = new FirefoxDriver(); (Firefox program)
  • WebDriver driver = new ChromeDriver(); (Chrome program)
  • WebDriver driver = new InternetExplorerDriver(); (Internet Explorer program)


WebDriver-Methods and Classes

WebDriver furnishes different answers for adapting to some of the possible difficulties in automation testing. WebDriver additionally permits analyzers to manage all sorts of complex web components, for example, check boxes, drop-downs and cautions.


Load Testing using Selenium

There are a few steps when it comes to load testing using Selenium WebDriver.


Create a Browser Configuration

Make a Thread Group and include “Chrome Driver Config” from Config Elements menu.

Selenium Thread Group


At that point, you have to give downloaded ChromeDriver as a way to your Config Element.

Selenium ChromeDriver


Implement Your Test

Include WebDriver Sampler under the Thread Group. This will bring a fundamental content, which opens a site page. We have to control this content.  So as to cooperate with the program, you have to utilize Selenium explicit techniques, as sendKeys, click(), and so on.  Here are a few hints:


Browse Open Command

This command opens the given URL



So as to do some UI-explicit activity, you have to import org.openqa.selenium bundle to your content. Simply add this line to your content.




SendKeys Command

In the event that you know about Selenium, you realize that you can arrive at component by cssSelector, ID, XPath and so on the pkg variable that we made, which encourages you discover the web component. This is the way you discover a component. You store the webElement into a variable called searchField.

SendKeys Command



At that point, you simply utilize the standard Selenium work SendKeys to think of some content.




Click Command

Selenium has an underlying snap order. You simply utilize a similar capacity subsequent to gaining the webElement. To begin with, we store the component and play out the snap activity.

Click Command





Additional Commands

Other than these essential orders, we should utilize a few orders explicitly intended for Selenium, so Selenium will have the option to catch sampler’s beginning and end time. Those two techniques will send Selenium the beginning and end signals for revealing purposes.

Selenium Beginning_End


Log Command

You should do some logging during your test. At that point you simply utilize the underneath order. Also user can see results of load test.

Log Command



Kinds of Requests

There are two kinds of solicitations you may be comfortable with, GET and POST.

Selenium GET Request






On the off chance that it’s a GET request, at that point it brings about a reaction that will be created at the program end and it will be sent over HTTP to the program driver and in the long run, the program driver with the assistance of JSON wire convention sends it to the UI (Eclipse IDE).


Advantages of Selenium WebDriver

  • It is one of the more popular open-source programs and is anything but difficult to begin with for testing online applications. It additionally permits you to perform cross program similarity testing.
  • Supports various working frameworks like Windows, Mac, Linux, Unix, and so on.
  • It gives similarity a scope of dialects including Python, Java, Perl, Ruby, and so on.
  • Offers help for current programs like Chrome, Firefox, Opera, Safari and Internet Explorer.
  • Selenium WebDriver finishes the execution of test contents quicker when contrasted with different instruments
  • More Concise API (Application Programming Interface) at that point Selenium RC’s
  • It additionally gives similarity iPhone Driver, Html Unit Driver and Android Driver


Difficulties with Selenium

Difficulties with Selenium include the following:

  • Supports just testing web applications
  • It doesn’t accept the Bitmap examination
  • For any detailing related abilities host to rely upon third party tools.
  • No vendor support for apparatus contrasted with business devices like HP UFT
  • As there is no ORC (Optical Character Recognition), practicality of items gets troublesome


LoadView: Load & Stress Testing in Real Browsers

LoadView allows developers and testers the ability to quickly create load and stress tests for a multitude of items, such as web applications, web pages, APIs, streaming media, etc.  All of the resources are managed for you. The solutions is completely web-based and there’s no need for additional hardware or software as the load injector servers are all managed for you.

For web applications, users can utilized the EveryStep Web Recorder and point and click their way through the application the same way a user or client would. Those scripts are then uploaded into the LoadView platform where, with only a few more clicks, can create your load testing scenario and run your test. Don’t waste time manually scripting scenarios for your web applications. Learn more about the features of LoadView.


Advantages of LoadView

These are just a few of the great advantages of LoadView:

  • Simple to use. It has an easy-to-understand user interface
  • Includes the EveryStep Web Recorder for easy and quick script recording
  • Integrates with Continuous Integration tools, such as Jenkins
  • Supports many technologies and frameworks, browsers, and devices
  • Test from nearly 20 global locations
  • Can test at the protocol level, as well as using real browsers


Basic Differences Between LoadView and Selenium



LoadView is a web-based solution Selenium is a tangible programming library and not an apparatus
LoadView does not need extended support for cross-browser testing Selenium supports wide range of browsers for cross browser testing
LoadView scale everything, and user can see graphical view of load testing Selenium doesn’t scale well
LoadView can capture a video for easy troubleshooting Selenium WebDriver is not able to capture a video and troubleshoot


The Selenium test suite can be composed in a TestNG XML suite. As the name proposes, it’s a XML document that depicts a whole Selenium test suite/situation to be executed. The subsequent record can be shared among test machines, conceding they have a similar test inclusion rationale.

Selenium can be utilized for some presentation testing (for example restricted data transmission testing), yet it can’t be utilized to stack test with exactness like LoadView. For instance, Selenium can’t produce a controlled number of solicitations for a considerable length of time.  LoadView makes setting up your load testing details, like concurrent users, delays, ramp up/ramp down times, and much more.

And like we mentioned earlier, LoadView can record step-by-step scripts for web application sessions through real browsers and replay the web sessions as the server sees them.  Moreover, LoadView has another end-client experience included, which empowers you to test your web pages and see what clients see when your site is under load.

Once your tests are complete, you can view the data through performance reports, session reports, waterfall charts, etc., to see the performance breakdown of every element and component. A lot of the time, there are errors and bugs that your users may not even be aware of, but it’s impacting load times and performance.  You can see exactly where issues are, so your teams can fix them quickly.


Conclusion: Selenium Load Testing Explained

LoadView and Selenium are both utilized for web application testing. However, the fundamental distinction is that LoadView is generally used to test the presentation of web applications under load and stress. Then again, Selenium is most appropriate for automation and cross program testing of a site. In light of what sort of testing is important for the undertaking, one can surely use LoadView to meet all of their performance testing needs.

LoadView provides comes ready with many out-of-the-box features that most tools in the market don’t include. Additionally, users have the option to choose from multiple subscription-based plans, or an on-demand plan, that best fits your organization’s needs.

Try LoadView for yourself today! Or better yet, schedule a live demo with one of our performance engineers. They will take you step-by-step through the LoadView platform and show you exactly how to set up, configure, and execute load tests.


Selenium Logo:  Diego Molina (diemol) / CC BY-SA (