public void setImageType(ImageType imageType) {
        this.defaultImageType = imageType;
    }
This is the amount of time it takes for PDFBox/java to write the image after
it has been rendered into a BufferedImage.  Some formats take much longer
to encode than others.
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-pdf-module/src/main/java/org/apache/tika/renderer/pdf/pdfbox/PDFBoxRenderer.java