Hiding and Showing Images
To improve system performance, images can be hidden with the SHOW PICTURES command. If the drawing includes several images, you can choose to hide individual images or all images. The SHOW options are:
On
Unhides a hidden image
Off
Hides an image
Box
Hides an image but places a reference frame around the hidden image
* 
When zooming with the dynamic mouse ( [Ctrl] + right mouse button), hide the images with the Box option.
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