Speed variation during backtest

 

Hi, is there anyone who could tell me if is't possible, by coding, to modify the speed of the backtest ?

 

I'd like to decrease it during open position in order to see better, and increase it after. But with code, not with the cursor.

 
I just pause the test when it does something or open count goes to zero. https://www.mql5.com/en/forum/133230
Reason: