performance - Efficient SVG rendering for PDFs (Java, Batik, Flying Saucer) -

i'm rendering pdfs xhtml , flying saucer. i've added svg images (icons etc) well. however, when try draw lot of images (like 5000+) rendering takes long (obviously). there 10 or different images draw, repeating them lot of times (same size).

is there way/library efficiently?

currently using batik, flying saucer combo draw images. following code used parse xhtml , find img tags place svg images:

@override public replacedelement createreplacedelement(layoutcontext layoutcontext, blockbox blockbox, useragentcallback useragentcallback, int csswidth, int cssheight) {     element element = blockbox.getelement();     if (element == null) {         return null;     }     string nodename = element.getnodename();     if ("img".equals(nodename)) {         saxsvgdocumentfactory factory = new saxsvgdocumentfactory(xmlresourcedescriptor.getxmlparserclassname());         svgdocument svgimage = null;         try {             svgimage = factory.createsvgdocument(new file(element.getattribute("src")).tourl().tostring());         } catch (ioexception e) {             e.printstacktrace();         }         element svgelement = svgimage.getdocumentelement();         element.appendchild(element.getownerdocument().importnode(svgelement, true));         return new svgreplacedelement(svgimage, csswidth, cssheight);     }     return this.superfactory.createreplacedelement(layoutcontext, blockbox, useragentcallback, csswidth, cssheight); } 

and draw images use:

    @override public void paint(renderingcontext renderingcontext, itextoutputdevice outputdevice,          blockbox blockbox) {      pdfcontentbyte cb = outputdevice.getwriter().getdirectcontent();     float width = csswidth / outputdevice.getdotsperpoint();     float height = cssheight / outputdevice.getdotsperpoint();      pdftemplate template = cb.createtemplate(width, height);     graphics2d g2d = template.creategraphics(width, height);     printtranscoder prm = new printtranscoder();     transcoderinput ti = new transcoderinput(svg);     prm.transcode(ti, null);     pageformat pg = new pageformat();     paper pp = new paper();     pp.setsize(width, height);     pp.setimageablearea(0, 0, width, height);     pg.setpaper(pp);     prm.print(g2d, pg, 0);     g2d.dispose();      pagebox page = renderingcontext.getpage();     float x = blockbox.getabsx() + page.getmarginborderpadding(renderingcontext, calculatedstyle.left);     float y = (page.getbottom() - (blockbox.getabsy() + cssheight)) + page.getmarginborderpadding(             renderingcontext, calculatedstyle.bottom);     x /= outputdevice.getdotsperpoint();      y /= outputdevice.getdotsperpoint();      cb.addtemplate(template, x, y); } 

an idea of scaling. 100 images take 2 seconds, 5000 images take 42 seconds on i5 8gb ram.

so there way store drawn svg in memory , paste more or something? because right seems take images separate images , eat memory , take forever.

managed optimize memory , speed doing 2 things. pre-generated svgdocuments in createreplacedelement method sped bit. main improvement pre-generating pdftemplates images. increased speed templates contained rendered images. rendering of regular text still slow, might turn down dpi.

edit: further optimization see is there way improve performance of flyingsaucer?