Postman Runner: CPU usage surges with iteration

Hi, I am running a collection through runner. Basically it is running same api over and over with certain delay. The problem I am facing is that, CPU usage grows significantly as the iteration count increases. I am using an Amazon EC2, and after 600-700 iterations, CPU usage surges and the becomes unusable gradually. So, I have to stop and run the runner again, then it starts with low usage CPU and the cycle continues.
Some additional information:

  1. 4 APIs in the collection (conditional run using setNextRequest)
  2. Postman interceptor is activated for cookies (however no new cookies through the browser during iteration)
  3. 10/20 seconds delay within each iteration