The smooth updates setting reduces flicker when LabVIEW redraws values on graphs.

When the smooth updates setting is off while LabVIEW updates an object, LabVIEW erases the contents of the object and draws the new value. Redrawing and erasing results in a noticeable flicker.

Using smooth updates avoids the flicker that erasing and drawing causes. When Smooth Updates is enabled, LabVIEW uses an offscreen buffer to minimize the flicker.

Notice Using smooth updates can slow performance depending on the computer and video system that you are using.
Right-click the graph and select Advanced » Smooth Updates from the shortcut menu.