In initial level once your Test Plan is ready, you can start your Load Test. The first step is to configure the injectors that will run JMeter, this as for any other Load Testing tool includes: Correct machine sizing in terms of CPU, memory and network, OS Tuning, Java setup: Ensure you install the latest version of Java supported by JMeter, Increase the Java Heap size. By default JMeter runs with a heap of 1 GB, this might not be enough for your test and depends on your test plan and number of threads you want to run.