Call Activity taking 2 Seconds to invoke and 2 Seconds to return

Hello All,

I have a business use-case for Mortgage Application where I need to call 2 embedded child sub-process(Fraud Check, SSN Validation) from the parent process which is triggered by the REST API. On debugging we observed that it takes roughly 2 seconds to instantiate the sub-process and 2 seconds for the control to come back to the main process. In the child process, I have database call which is taking only 200 ms. Overall response time of the Process API is approx 6 seconds. I am seeing are there any ways to improve this.