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Gets or sets a value indicating whether to use a faster but less precise method of laying out text when generating output.
public bool UseFastTextOut { get; set; }
When laying out text, by default the MeasureText Windows API is used. It is precise but rather slow which may be noticeable if the document contains large amounts of text.
Setting this property to true uses the MeasureString .NET API instead. It is much faster but may result in non-optimal text layout.