Here are some tips which allow to maximize the barcode reading speed:

• Recognize only necessary barcode types (see ReaderSettings.ScanBarcodeTypes property). This can increase barcode reading speed up to 2 times.
• Recognize barcodes only in necessary directions (see ReaderSettings.ScanDirection property). This can increase barcode reading speed up to 20%.
• Find and use optimal threshold values for your color images(see ReaderSettings.Thresholdproperty), do not use authomatic threshold mode (see ReaderSettings.ThresholdMode property) if this is possible. This can increase barcode reading speed up to 10%.
• Set the ReaderSettings.ExpectedBarcodes property if number of barcodes is known.
• Set the ReaderSettings.SearchMirrored2DBarcodes property to False if images of recognizing 2D barcodes cannot be mirrored.
• Use only black-white images with barcodes in your system (if possible). This can increase barcode reading speed up to 20%.
• Disable ReaderSettings.RemovePeasfeature if image with barcodes has good quality. This can increase barcode reading speed up to 5%.
• Don't use ScanDirection.Angle45and135 if you don't have for recognition low and wide bars barcodes rotated to 30-60 degrees. This can increase barcode reading speed up to 30%.
• Disable ReaderSettings.SearchDistortedDataMatrixBarcodes feature if your DataMatrix barcodes have no dimensional distortion. This can increase DataMatrix barcode reading speed up to 50%.
• Decrase value of ReaderSettings.DataMatrixLPatternMaxErasures property if your DataMatrix barcodes have no erasures. This can increase DataMatrix barcode reading speed up to 50%.
• Disable ReaderSettings.SearchDistortedQRBarcodes feature if your QR barcodes have no dimensional distortion. This can increase QR barcode reading speed.
• Use ReaderSettings.ImageScaleFactor property to downscale image if barcodes on image is large (single bar or cell greater than 6 pixels). This can increase barcode reading speed up to several times.
• Correct (appropriate) value of ReaderSettings.MatrixBarcodeMaxCellSize property increases reading speed of two-dimensional barcode.