After a simulation has been started, the flow of the simulation is made visible through:
The green dotted box that indicates the active component and moves with each step from one component to the next.
The number of records displayed on the link, which follows the box movement.
The number of records being processed within each single step is dependent on the current value of Read Block Size of the previous component with a Read Block Size property.
Selecting a small number is useful while performing a simulation. A large number for Read Block Size can significantly enhance performance while a project is executed.