Klause Knopper is using a script that makes the original version run faster.
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#!/bin/sh
find / -anewer /KNOPPIX.build/mkisofs.timestamp -not \( -type d -o -path /KNOPPIX.build\* -o -path /tmp\* -o -path /proc/\* -o -path /mnt/\* \) -printf '%p %A@\n' | sort -rn +1 -t' ' | awk -F' ' '{print $1 " " ++i}' > /KNOPPIX.build/mkisofs.sort

echo "/bin/mkdir 10090" >> /KNOPPIX.build/mkisofs.sort
echo "/bin/chown 10080" >> /KNOPPIX.build/mkisofs.sort
echo "/bin/cp 10070" >> /KNOPPIX.build/mkisofs.sort
echo "/bin/ln 10060" >> /KNOPPIX.build/mkisofs.sort
echo "/bin/rm 10050" >> /KNOPPIX.build/mkisofs.sort
echo "/dev/* 20000" >> /KNOPPIX.build/mkisofs.sort
echo "/etc/* 30000" >> /KNOPPIX.build/mkisofs.sort
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But I can't understand how it works,
What is /KNOPPIX.build/mkisofs.timestamp and /KNOPPIX.build/mkisofs.sort
Has anyone any idea how it works?

Thanks