Re: PNG loading time

Hi Norbert,

On Sun, 8 Feb 2026, Norbert Preining wrote:
> loading PNG images seems to be very slow in TL 2025 / Linux. Just
> test-loading images directly with libpng gives far better speeds
> (which is also not surprising), but pdflatex sometimes takes seconds
> for a single image.
>
> Is this a problem with the particular libpng image we use in TL2025,
> or with surrounding code in graphic(xs)?

does the log show "(PNG copy)" when the image is included? Maybe the
earlier image was compatible with this fast inclusion mode of
pdftex/luatex (such "fast" PNGs can be generated e. g., by pnmtopng).
When it's really slow, maybe something with the library, no idea.

Best Regards
Hartmut