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Poppler 21.09 will have a massive speed increase for PDF files that use lots of save/restore PDF commands

Submitted by Rianne Schestowitz on Friday 27th of August 2021 02:49:59 PM Filed under
KDE

Take the file from poppler issue 1126. It's a file that doesn't look super complicated, a map of some caves.

With Poppler 21.08 it took 46 seconds to render in my relatively powerful i9-8950HK

Thanks to a patch from Thomas Freitag that time got reduced to 28 seconds by not recalculating again something we had already calculated and just copying it. Huge improvement! [This patch was developed prior to the filing of issue 1126, i guess Thomas had found similar issues on his own]

Then issue 1126 was created yesterday and it was clear that we were still super slow, mupdf/gs/firefox/chromium can render the file almost instantly, and we were at 28 seconds.

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