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gswin64c.exe -q -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dEPSCrop -dAlignToPixels=0 -dGridFitTT=2 "-sDEVICE=pngalpha" -dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-r72x72" -g612x792 "-sOutputFile=test-%08d.png" "-fspru198j_programmers_guide.pdf"
and the conversion took only 3 minutes by a memory usage peak of 90MB! This means ImageMagick spends 22 minutes by just throughputting, am I right?
P.S.: The -verbose output of ImageMagick says "gswin32c.exe" but I don't have this file on my computer. So parts of the -verbose message seems to be faked. Furthermore, the second -f parameter is strange since it isn't necessary on conversion.