ArcMap has two great features for pausing drawing ("Pause Drawing" in the map view and "Toggle Draft Mode" in the layout view). This capability is fantastic for when the user needs to perform a series of tasks (reordering layers, changing a host of symbology settings, removing and grouping layers, changing labels, etc), without redrawing the map/layout every time a property is changed.
The 2016 release of ArcGIS Pro 1.4 does not have this capability for map tabs or layout tabs. This disrupts the workflow, because the user has to wait for the map to render between steps.
This ideas has been marked by Kory Kramer as a Duplicate of Pause Drawing in ArcGIS Pro. Please visit that idea, up vote and add comments if you'd like to see Pause Drawing in Pro maps and/or Toggle Draft Mode in Pro layouts. This was originally marked as a Duplicate but is now changed specifically to Toggle Draft Mode.