proportionalimage Performance property
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Applies to
acProportionalImage as subproperty of JPEGProperties structure.  

  TJPEGPerformance = (jpBestQuality, jpBestSpeed);  
property Performance: TJPEGPerformance;  

Controls the trade-off between color quality and speed of decompression.  
Use Performance to set the performance of the JPEG image when reading, that is, for decompressing files. This property is not used for writing out files.  
Performance affects the display of the internal bitmap image. This image is a 256 color bitmap. Setting Performance to jpBestSpeed may cause some dithering in the bitmap image.  

See also
CompressionQuality, Grayscale, PixelFormat, ProgressiveDisplay, ProgressiveEncoding, Scale and Smoothing properties.