HIDETURTLE (HT)
Syntax HIDETURTLE 
HT 
 
Explanation HIDETURTLE makes the current turtle(s) disappear from the screen. The turtle continues to draw, but cannot be seen. The turtle draws much faster when it is hidden.

HIDETURTLE can also be used to hide bitmaps and controls.

Also see SHOWTURTLE and SHOWN?.
 
 

Example

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