Documentation
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Reference
Preferences
Notebook Options
PrivateNotebookOptions->{...}
"DoubleBuffer"
• "DoubleBuffer" is an option for notebooks that determines if double buffering, a method of reducing flicker while a notebook is being edited, is used for a notebook.
• With the default setting "DoubleBuffer" 
True, two copies of the rendered notebook are stored in memory at all times. While the screen display of the notebook is being updated, the back-up copy is displayed on the screen, reducing the flicker caused by the editing changes.
