gpg vs aespipe

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I'm checking the efficiency of gpg and aespipe when doing, seemingly, the same
I use gpg 1.2.4 from the distro and aespipe 2.2d compiled from source. That's
I get when I repeat several times and in different order the following:

$time gpg -z 0 -c --cipher-algo aes256 --passphrase-fd 3 3< pass < 100MB >
4.90user 0.06system 0:04.96elapsed 99%CPU

$time aespipe -e aes256 -H sha512 -p 3 3< pass < 100MB > /dev/null
1.67user 0.04system 0:01.71elapsed 99%CPU

You see that aespipe is three times faster than gpg. So my questions are: are
really doing the same thing? Is just that aespipe is more efficiently coded? Is
encrypted data equally secure?

Thank you for the answers

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