Investigate pdfium as a possible replacement PDF loader #689
Description
pdfium is a very fast PDF rendering library, perhaps 2x to 5x faster than poppler.
https://pdfium.googlesource.com/pdfium/
https://github.com/nathanstitt/dc-pdf-raster-test
It's currently a little immature in terms of packaging -- when there's an official Debian package, investigate a pdfload using this instead of poppler.