An extremely naive program can sha1 hash 1 million 100 byte strings on my computer in less than half a second: https://gist.github.com/llimllib/72f60aa33b32e422962d876ddf0...

This is literally the first program I came up with, no attempt to optimize it at all.

There is zero chance that the AWS sync command is filling my CPU just by hashing bytes

edit: I'm going to try not to let you nerd snipe me into doing the profiling the AWS CLI needs to be doing, for them. Because that's now what I desire to do.