in a specific power point file with only 1 simple slide, conversion is really slow, about 30 to 40 seconds!
other files i’ve worked with took only 15 seconds to process the first slides and later slides were much faster to process.
both lines below works slowly:
Presentation pre = new Presentation('slow.pptx');
BufferedImage image = pre.getSlides().get_Item(0).getThumbnail(500, 500);
you may find the sample file here:
would be nice to know what’s causes the slowness so i could disable it from power point itself until a fix is released.