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Problem: Saving a Map document takes a long time

Description

ArcMap takes a while to save a Map document.

Cause

This happens because ArcMap is also saving a thumbnail image of the Map document, which will take as long to create as a redraw in the Layout View.

Solution or Workaround

Disable the thumbnail saving option. Click File > Map Properties, and uncheck the 'Save thumbnail image with map' check box.