Use of Parallel Activity

In which scenerios should I use the parallel activity?
Any specfic use case which with which my automation can be made better?

Parallel activity processes more than one workflow in parallel.
you can refer the link to know more about parallel activity.


Can you help me with an example use case?


One of the example is Automation of button click which opens File dialog box

Put Click operation of button block. In another parallel block put a delay of 2 sec and configure interaction on FIle chooser dialog box controls


Whether taking this approach will decrease the process execution time?