# Load Testing Guide The Loadmill's Load Testing module allows users **to replay their API tests at scale** and use real traffic with the ability to target specific countries or go global. ![](/files/ZL4CLj98Vg2C2ksEXe1c) In this quick guide to Loadmill we will learn how to: 1. Create and run a very simple load test in just a few seconds. 2. Create an API test by using our [Chrome recorder extension](https://docs.loadmill.com/working-with-the-recorder) and run it as a load test in Loadmill. 3. Run load tests as DRY RUN or at scale. ## Let's create and run your first Load test together. There are two ways to do that: * Creating and running a load test from scratch in Loadmill. * Recording an API test by using our [Chrome recorder extension](https://docs.loadmill.com/working-with-the-recorder) and running it as a load test in Loadmill. ### Creating and running a load test from scratch in Loadmill: {% embed url="" %} The simplest load test you can create is an HTTP GET request to your web server. {% hint style="warning" %} :brain: Load test may include **100 requests maximum**. {% endhint %} All you need to do is: 1. Click the **NEW TEST** button on the top navigation menu. This will get you to our test editor. 2. Give your new test a short description `My First Test` 3. Copy and paste the website URL into the **URL** text box. In our case, it's going to be `https://loadmill-test-blog.herokuapp.com`. This is a ghost blogging server we are using for testing and demos, so you can use it for tests. 4. Click the **DRY RUN** button as we recommend running your load test for the first time as a [trial test](https://docs.loadmill.com/getting-started/getting-started-1#running-a-trial-test). ![](/files/5FdWjobbC8AlwsfMMvSm) That's it! You have just created and run your first load test in under a minute 🎉 See how to run it at scale [here](https://docs.loadmill.com/getting-started/getting-started-1#running-a-load-test-at-scale). ### Recording an API test by using [our Chrome recorder extension](https://chrome.google.com/webstore/detail/loadmill-recorder/gdkmnfehipofdefhpegbgkkocinlaofd?hl=en) and running it as a load test in Loadmill: 1. Create an API test as explained [here](https://docs.loadmill.com/api-testing/getting-started#creating-and-running-an-api-test-by-using-our-chrome-recorder-extension). 2. Go to Loadmill and open the recorded test in your Test Suite. 3. Click on three dots next to the run icon - Click **Convert To Load Test**. 4. To run the load test for the first time, we recommend running it as a trial test. See how to do that below. ### Running a trial test Before we run a massive load test, we usually want to run just a single iteration of the scenario, to make sure everything works as expected. This is what we call a **DRY RUN**. It's also a very easy way to test your API and can be exported to a **Functional Test** which you can later [use in your CI](https://docs.loadmill.com/integrations/npm-modal). When we are creating a new test or extending/maintaining an old one, we like to iterate several times - modifying the test and trying it out - until we get the result we want. To start a trial run, click the **DRY RUN** button at the bottom of the editor. ![](/files/-MNOl2TQuaHSF8rKCw_Z) ### Running a load test at scale Now that we know that our test is configured correctly, we can run it at scale. To do that: 1. Click the **RUN TEST** button at the bottom of the test editor. 2. Set Test Duration (minutes) and **Maximum Concurrent Sessions OR Maximum Requests Per Second** you would like this test flow to run. 3. Click on **Advanced** to set additional parameters. For example, you can set **Ramp-up** **Duration** (1 minute by default) hence a number of concurrent sessions will increase linearly during the ramp-up. 4. Click **RUN**. ![](/files/VufxX0zFCHVBLFemvOtZ) {% hint style="info" %} high-volume:man\_mage: **Note**: At some point you may notice a message stating that your domain is not *verified* - this only means that you may not run high-volume tests before proving ownership of your domain/hostname. You can learn how to do that [**here**](https://docs.loadmill.com/load-testing/setup/domain-verification) (it's actually pretty easy). {% endhint %} As the test progresses we can see the number of concurrent sessions **ramping up** linearly and see how **response time metrics** change over time. ![](/files/-MNOnaYkgPfUE5jbBYw_) In addition, you can **adjust concurrency** **during a test run**. This is a very powerful feature that allows to see how the test performs with dynamic concurrency changes in real time. ![](/files/-MNSNWvW-a2253t7erkD) Loadmill keeps track of the request **error rate** and fails the test if it passes a certain threshold (%50 by default). We can see the response time for each request and are able to drill down and see the error statistics for each one. {% hint style="info" %} :brain: You can easily run your API Test Suite as load tests by clicking on the drop-down icon within the **RUN SUITE** button - **Run as load test**. {% endhint %} ![](/files/7nNWpas6b4MBa1B2tF0Q) Keep exploring the guides to learn how to analyze load test results, set thresholds and more. ### Support We are always here if you need any help! Click on the bubble chat button in the lower-right corner of the screen or drop us a line at . --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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