Use the Annotation > Viewport > Redraw section of the Default Settings dialog box to optimize redraw time by specifying what elements are to be included in a dynamic redraw operation.
The following options are available:
• Parts as Box: Parts, assemblies, sketches and other elements that are in the current viewport and are smaller than a given amount of pixels, are drawn as a box only. To see the included geometry, simply zoom-in on those boxed parts. Use Box Size to specify the number of pixels and Box Color to specify the color of representative box.
• Dynamic Redraw: Use this group of settings to suppress elements types such as dimensions, text, and hatches during dynamic zooming or panning operations.
To display the Default Settings dialog box, right-click the 2D viewport and select Viewport Settings in the shortcut menu.