Normally, SIMPLIS will add a point before and after a logic device changes state. These extra point ensure the graph waveform will display a logic edge. Checking this box will inhibit the extra points which define logic gate output transitions.
This tells SIMPLIS to ignore any state information that it may have stored and which could be used to speed up the run. For example, any stored snapshots (see SIMPLIS Transient Analysis) will not be used if this is selected.
To learn more about placing .KEEP statements in a schematic hierarchy, see the Advanced SIMPLIS Training topic: .KEEP Statement in the Hierarchy.