title: How to insert a delay in Jmeter based on Threads
body: <p>I have 3 ThreadGroups namely: ThreadGroup1, ThreadGroup2 and ThreadGroup3. I want to run ThreadGroup 1 and 2 simultaneously and then once both these are done, I want to run ThreadGroup 3. </p>
  
  <p>Is there a way I can put a timer/delay till a certain number threads are completed?</p>