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This option allows you to set the quality of a generated image for displaying in the Preview Area. Quality of output image is directly related to the time of its generation. Select in the popup list one of the 4 quality modes by left clicking or using the Up, Down and Enter keys:
 
 
1. Low (fastest)
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Low image quality, fast processing.
 
2. Medium
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Medium image quality, average processing.
 
3. High (slow)
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High image quality, slow processing.
 
4. Highest (very slow)
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Best quality, very slow processing.
 
Note:  By using this setting you can select the quality for image displaying. Saving image to a file occurs with maximum quality, by default. If in Preferences the 'Use highest quality rendering when saving' checkbox is disabled, the saving image to a file will occur with the current viewing quality (see Preferences).