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Network Throttling

There might be instances where you would have to check the functionality of your website on low latency networks ( 2G/3G/LTE) or even offline. Such networks have variable upload and download speeds which can alter how your website performs on different browsers.

In order to validate your website on such network profiles, you can simulate these network conditions using our capabilities. If you want the test suite to start with the default network use our preset capabilities. However, the device will have unobstructed internet connectivity.

capabilities.setCapability("networkThrottling", "Regular 4G");

List Of Network Profiles#

ResetReset to defaultReset to defaultReset to default
Regular 2G25050300
Good 2G450150150
Regular 3G750250100
Good 3G1 Mbps75020
Regular 3G4 Mbps3 Mbps20
DSL2 Mbps1 Mbps5

Custom Network Profile: For creating custom network conditions you can use objects. Define the upload speed, download speed, and latency for the custom condition, as shown in the above table.

Configuring Network Profile#

The Selenium JavaScript Executor allows you to enable network simulation capabilities for tests and to generate custom log files. You can use conditional capabilities to simulate network conditions for individual test cases.


LambdaTest now allows you to select a network profile before running automation tests. This will allow you to conduct the functional tests of your website or web app on low/high latency networks and offline. In order to simulate the network conditions, you can use the networkProfile capability as shown below.

networkProfilecondition: a string or object representing browser network conditionsdriver.execute_script(“networkProfile”, {“condition”: {“download”: 500,“upload”: 100,“latency”: 30}})

Configuring Network Throttling In Test Automation#

To configure network throttling in automation, we have used the LambdaTest TestNG GitHub repository to run our automation tests. You would just have to define network throttle capabilities in your automation scripts.

DesiredCapabilities caps = new DesiredCapabilities();caps.setCapability("platform", "macOS High Sierra");caps.setCapability("browserName", "Safari");caps.setCapability("version","11.0");caps.setCapability("build", "Demo-TestNG");caps.setCapability("name", "TestNG-Todo-Script-1");caps.setCapability("networkThrottling", "Regular 4G");caps.setCapability("visual", true);caps.setCapability("video", true);caps.setCapability("console", true);

The following below is the TestNG code. It will validate your LambdaTest credentials for authentication purposes. The code will select the basic capabilities such as OS, browser, browser version, network, and so on.

package com.lambdatest;
import org.openqa.selenium.By;import org.openqa.selenium.remote.DesiredCapabilities;import org.openqa.selenium.remote.RemoteWebDriver;import org.testng.Assert;import org.testng.annotations.AfterSuite;import org.testng.annotations.BeforeSuite;import org.testng.annotations.Test;
public class TestNGTodo1 {
    private RemoteWebDriver driver;    private String Status="failed";
    @BeforeSuite    public void setup() throws MalformedURLException {        String username = System.getenv("LT_USERNAME");        String authkey = System.getenv("LT_ACCESS_KEY");        String hub = "";
        DesiredCapabilities caps = new DesiredCapabilities();        caps.setCapability("platform", "macOS High Sierra"); // If this cap isn't specified, it will just get the any available one        caps.setCapability("browserName", "Safari");        caps.setCapability("version","11.0");        caps.setCapability("build", "Demo-TestNG");        caps.setCapability("name", "TestNG-Todo-Script-1");        caps.setCapability("networkThrottling", "Regular 4G");  //To enable network throttling        caps.setCapability("visual", true);     // To enable step by step screenshot        caps.setCapability("video", true);     //To enable video recording        caps.setCapability("console", true);  //To capture console logs            driver = new RemoteWebDriver(new URL("https://" + username + ":" + authkey + hub), caps);            }    
    @Test    public void basicTest() throws InterruptedException {        String spanText;        System.out.println("Loading Url");        Thread.sleep(100);        driver.get("");        Thread.sleep(100);
        System.out.println("Checking Box");        driver.findElement("todo-1")).click();        Thread.sleep(400);
        System.out.println("Checking Another Box");        driver.findElement("todo-2")).click();        Thread.sleep(400);
        System.out.println("Checking Box");        driver.findElement("todo-3")).click();        Thread.sleep(400);
        System.out.println("Checking Another Box");        driver.findElement("todo-4")).click();        Thread.sleep(400);
        driver.findElement("todotext")).sendKeys(" List Item 6");        driver.findElement("addbutton")).click();        Thread.sleep(200);
        driver.findElement("todotext")).sendKeys(" List Item 7");        driver.findElement("addbutton")).click();        Thread.sleep(200);
        driver.findElement("todotext")).sendKeys(" List Item 8");        driver.findElement("addbutton")).click();        Thread.sleep(200);
        System.out.println("Checking Another Box");        driver.findElement("todo-1")).click();        Thread.sleep(300);
        System.out.println("Checking Another Box");        driver.findElement("todo-3")).click();        Thread.sleep(300);
        System.out.println("Checking Another Box");        driver.findElement("todo-7")).click();        Thread.sleep(300);
        System.out.println("Checking Another Box");        driver.findElement("todo-8")).click();        Thread.sleep(300);
        System.out.println("Entering Text");        driver.findElement("todotext")).sendKeys("Get Taste of Lambda and Stick to It");        Thread.sleep(300);
        System.out.println("Checking Another Box");        driver.findElement("todo-9")).click();        Thread.sleep(300);        // Let's also assert that the todo we added is present in the list.
        spanText = driver.findElementByXPath("/html/body/div/div/div/ul/li[9]/span").getText();        Assert.assertEquals("Get Taste of Lambda and Stick to It", spanText);        Status="passed";        Thread.sleep(150);
    @AfterSuite    public void tearDown() {        driver.executeScript("lambda-status=" + Status);        driver.quit();    }

Here is the demo screenshot of the above-executed automation test. You can find your defined network capabilities under the section ‘Input Config’ by navigating to the ‘METADATA’ section of your automation build-logs.


In case you have any questions, feel free to share them with us.Our experts are available on 24/7 Customer chat support. You can also drop us a mail at [email protected] Happy testing! 🙂

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