Display
Tools 
Display tools are provided to refine (or coarsen) the display of wireframe, surface or solid geometry. You can refine or clear the facets used to display surfaces or solids. You can also automatically refine the display of wireframe geometry (i.e., arcs, circles, and curves).
View (Object/Part/Sketch/Sheet Level)
This command turns auto curve refinement on
and off. When on, curves will display more true to their actual form.
Turning this off during large assemblies will help speed up display functions.
This command is similar to the Refine Facets
command used to refine shaded displays.
View (Part/Sketch Level)
When the Shaded Display mode is active, facets (planar polygons) are generated and stored with the faces of each visible object. Shading algorithms are then applied to this faceted representation. The result is a secondary model that is a shaded representation of the original part.
The total number of facets generated is based on the View Extent indicator value located in the lower left corner of the Graphics Window. When this command is executed, faces whose facets are "out-of-tolerance" relative to the active view extent are refacetted. If a face's display tolerance was explicitly reset using the Set Face Display Tolerance command, are not refacetted, even if the explicit tolerance is large relative to the active view extent. The figure below illustrates display facet regeneration based of varying view extent values.
Select the faces to refine or middle-click to select all faces. The facet adjustment will be apparent when the display mode is set to Shade.
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Optional Inputs 
Refine throughout assembly - Check this box to refine the facets in every component in the active assembly. Otherwise only the active part is refined.
Use
levels of detail -
Sometimes, using levels of detail can slow the shading
process down. You
can check this box to disable levels of detail. You
can experiment to see which way works best for displaying your models.
Notes
This command provides a means of speeding up the shaded display. It is best applied to static or seldom changing models. Simply zoom in close enough to get sufficient detail and use this command.
View (Part/Sketch Level)
Use this command to clear all facet data (used for shaded display) from the active part. The next time the part is displayed in shaded mode, facet data will be regenerated. Deleting the facet data from a part before saving will reduce the file size. If the part is currently in shaded mode, it will be changed to wireframe mode upon completion.
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Optional Inputs
Clear Facets from Assembly
Check this box to clear the facets in every component in the active assembly. Otherwise only the active part is cleared.
Understanding Shaded Display Facets and Geometry (see CAD Tips & Techniques).