--- description: Be default, JMeter sends the request without pausing between each request. In that case, JMeter could overwhelm your test server by making too many requests in a short amount of times. title: "JMeter Timer: Constant, Gaussian, Uniform Random" image: https://www.guru99.com/images/jmeter-timer.png --- [Skip to content](#main) **⚑ Smart Summary** JMeter timers introduce a controlled delay between requests so a thread pauses like a real user, preventing server overload and reproducing realistic think time across Constant, Gaussian, Uniform, and scripting based types. - ⏸️ **Constant Timer:** Adds the same fixed delay each request. - πŸ”” **Gaussian Random Timer:** Delays by a normal distribution curve. - πŸ“ **Uniform Random Timer:** Delays randomly within a set range. - πŸ“ **Scripting Timers:** BeanShell, BSF, and JSR223 add custom delays. - πŸ€– **AI Assistance:** AI models think time from real traffic. Read More ![JMeter Timers](https://www.guru99.com/images/jmeter-timer.png) ## What are Timers? By default, JMeter sends the request **without pausing** between each request. In that case, JMeter could **overwhelm** your test server by making too many requests in a short amount of times. Let us imagine you send **thousands** of requests to a web server under test in a few seconds. This is what happens! [![Timers in JMeter]()](https://www.guru99.com/images/TimerOverload.png) Timers allow JMeter to **delay** between each request which a thread makes. A timer can solve the server **overload** problem. Also,** in real life visitors do not arrive at a website all at the same time, but at different time intervals. So Timer will help mimic the real-time behavior.** Following are some **common** types of a timer in JMeter ## Constant Timer Constant timer delays each user request for the **same** amount of time. [![Constant Timer in JMeter]()](https://www.guru99.com/images/ConstantTimer.png) ## Gaussian Random Timer [Gaussian](http://hyperphysics.phy-astr.gsu.edu/hbase/math/gaufcn.html) random timer delays each user request for a **random** amount of time. [![Gaussian Random Timer in JMeter]()](https://www.guru99.com/images/RamdomTimer.png) ### Parameters | Attribute | Description | | --- | --- | | Name | Descriptive name for this timer that is shown in the tree | | Deviations (milliseconds) | A **parameter** of Gaussian Distribution Function | | Constant Delay Offset (milliseconds) | **Additional** value in milliseconds | So the total delay is described as below figure: [![Gaussian Random Timer in JMeter]()](https://www.guru99.com/images/TotalDelay.png) ## Uniform Random Timer Uniform random timer delays each user request for a random amount of time. [![Uniform Random Timer in JMeter]()]() ### Parameters | Attribute | Description | | --- | --- | | Name | Descriptive name for this timer that is shown in the tree | | Random Delay Maximum | Maximum random number of milliseconds to delay. | | Constant Delay Offset (milliseconds) | **Additional** value in milliseconds | **The total delay is the sum of the random value and the offset value.** **Don't Miss:** - [How to Download & Install Apache JMeter (Windows)](https://www.guru99.com/guide-to-install-jmeter.html) - [Assertions in JMeter: Response Assertion with Examples](https://www.guru99.com/assertions-in-jmeter.html) - [HTTP Proxy Server in JMeter: Record Example Script](https://www.guru99.com/how-to-use-jmeter-for-http-proxy-server-testing.html) - [9 JMeter Alternatives (2026 Update)](https://www.guru99.com/jmeter-alternative.html) ## BeanShell Timer The [BeanShell](http://www.beanshell.org/) Timer can be used to **generate** a delay time between each user request. ## BSF Timer The BSF Timer can be used to generate a delay between each user request using a [BSF](https://en.wikipedia.org/wiki/Bean_Scripting_Framework) scripting language. ## JSR223 Timer The JSR223 Timer can be used to generate a delay between each user request using a [JSR223](https://en.wikipedia.org/wiki/JSR223) scripting language ## How to Use Constant Timer In this example, you will use **Constant Timer** to set **a fixed delay** between user requests to google.com. Let start with a simple test script 1. JMeter creates **one** user request to [http://www.google.com](http://www.google.com/) **100** times 2. **Delay** between each user request is **5000** ms Here is the **roadmap** for this practical example: [![Use Constant Timer in JMeter]()](https://www.guru99.com/images/FlowTimer.png) ## Pre-condition We **re-use** the Step 1 and Step 2 in tutorial [JMeter Performance Testing](https://www.guru99.com/jmeter-performance-testing.html). ### Step 1) Add Thread Group Right click on the [ Test Plan](https://www.guru99.com/test-planning.html) and add a new thread group: **Add**-> **Threads (Users)** ->**Thread Group** In Thread Group control panel, enter Thread Properties as following [![Add Thread Group]()](https://www.guru99.com/images/ThreadProperty.png) This setting lets JMeter create **one** user request to [http://www.google.com](http://www.google.com/) in **100** times ### Step 2) Add JMeter elements - Add HTTP request default - Add HTTP request ### Step 3) Add Constant Timer Right-click **Thread Group** **->**** Timer** **->**** Constant Timer** [![Add Constant Timer]()](https://www.guru99.com/images/AddConstantTimer.png) Configuring Thread Delay of 5000 milliseconds [![Add Constant Timer]()](https://www.guru99.com/images/ThreadDelayConstantTimer.png) ### Step 4) Add View Results in Table View Results in Table displays the test result in table format. Right click **Add** **->**** Listener** **->****View Result in Table** [![Add View Results in Table]()](https://www.guru99.com/images/AddViewResult.png) View Results in Table displays as below figure [![Add View Results in Table]()](https://www.guru99.com/images/AddViewResultTable.png) ### Step 5) Run your test When you are ready to run a test, click **the Run** button on the menu bar, or press **Ctrl+R** This is the result of this test [![Run The Test]()](https://www.guru99.com/images/RunYourTest.png) For example, in the above figure, let analyze the **Sample 2** - **Start time** is 22:05:01.866 - **Sample Time** of Sample 2 is 172 ms - **Constant Timer**: 5000 ms (as configured) - **End Time** of this sample is = 22:05:01.866 + 172 + 5000 = 22:05:07.038 So the Sample 3 should start at the time is **22:05:07.039** ( As shown in the above figure) The **delay** of each sample is **5000** ms If you change the Constant Timer is **zero**, you will see the result is changed [![Run The Test]()](https://www.guru99.com/images/SampleTimer.png) Let analyze the **Sample 1** - **Start time** is 22:17:39.141 - **Sample Time** of Sample 2 is 370 ms - **Constant Timer** : 0 ms (as configured) - **End Time** of this sample is = 22:17:39.141+ 370 + 0 = 22:17:39.511 So the **Sample 2** should start at the time is **22:17:39.512** (Shown in the above figure) ## Troubleshooting If you face the issue while running the above scenario … do the following 1. Check whether you are connecting to the internet via a proxy. If yes, remove the proxy. 2. Open a new instance of JMeter 3. Open the [TimerTestPlan.jmx](https://drive.google.com/uc?export=download&id=0B_vqvT0ovzHcUjJ5Vm1rN0g1ZlU) in JMeter 4. Double Click on Thread Group -> View Result in Table 5. Run the Test ## FAQs πŸ•’ What is think time in JMeter? Think time is the pause a user takes between actions, reproduced by JMeter timers. πŸ“ Where is a timer applied in the test plan? A timer applies to every sampler in its scope; at thread-group level it delays all requests there. βš–οΈ Constant Timer versus Uniform Random Timer, what differs? Constant Timer adds a fixed delay; Uniform Random Timer adds a random delay within a range. πŸ€– Can AI suggest realistic think times for load tests? Yes. AI analyzes traffic logs and recommends think-time distributions matching real user pacing in JMeter. 🧠 How does AI improve performance test modeling? AI learns usage patterns, generates realistic pacing, and flags anomalies, making load tests more predictive. #### Summarize this post with: ChatGPTPerplexityGrokGoogle AI **Stay Updated on AI** **Get Weekly AI Skills, Trends, Actionable Advice.** ##### Sign up for the newsletter Subscribe for Free You have successfully subscribed. 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