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New hardcore #PDF rendering performance benchmark for #Poppler:
"Jesus Christ it's a #Lyon (map), get in the car!" 
That map takes 26 seconds to render with Poppler on #Linux, but only 6 seconds with PDFjs, or 15 seconds with XPDF: https://gitlab.freedesktop.org/poppler/poppler/-/issues/1555
I've profiled the issue on the various Poppler rendering backends, and there are some hypotheses about the slowness. If anyone can help fix this, that would be fantastic.
@nekohayo first let's put this out of the way: is Popple build with Boost? The Splash backend has a major performance hit if it is not build with boost, and some packagers still think they know better disabling boost.
(I see the Splash backend in the flamegraph)
@hub How to tell easily? Tested Okular+Evince using Fedora 41's packages, and Papers git from either GNOME Builder or the nightly flatpak…
@nekohayo can't speak for papers but the Fedora package seems to be alright. They added it in 21.07