Increase speed of closing positions by bot

Dear Guys,

When using:

foreach (var pos in Positions) ClosePosition(pos);

the positions are closed visibly slower than when using built-in Close button in Positions tab (lower right part of the interface). When I have 4-5 position, closing them with cBot takes 2-3x more time than using built-in button.

Is there a way to increase the speed? I am not familiar with async functions, maybe I should look there?

Thanks, Chris