find setuid files and directories writing the details to /root/suid.txt , and find large files writing the details to /root/big.txt, traversing the filesystem just once
find / \( -perm -4000 -fprintf /root/suid.txt '%#m %u %p\n' \) , \  \( -size +100M -fprintf /root/big.txt '%-10s %p\n' \)