Optimized version for my machine - branched from oh-my-zsh https://github.com/robbyrussell/oh-my-zsh/blob/7a63ccabf662138777a43d014a1a0ab5d8f86ab0/plugins/aws/aws.plugin.zsh

aws.plugin.zsh

_homebrew-installed() {
  type brew &> /dev/null
}

_awscli-homebrew-installed() {
  brew list awscli &> /dev/null
}

export AWS_HOME=~/.aws

function agp {
  echo $AWS_DEFAULT_PROFILE
}

function asp {
  local rprompt=${RPROMPT/<aws:$(agp)>/}

  export AWS_DEFAULT_PROFILE=$1
  export AWS_PROFILE=$1

  export RPROMPT="<aws:$AWS_DEFAULT_PROFILE>$rprompt"
}

function aws_profiles {
  reply=($(grep profile $AWS_HOME/config|sed -e 's/.*profile \([a-zA-Z0-9_-]*\).*/\1/'))
}

compctl -K aws_profiles asp

# This is the default install location for homebrew. brew and
# brew list are very slow, so we'll check the default path first
if [ -f "/usr/local/opt/awscli/libexec/bin/aws_zsh_completer.sh" ]; then
  _aws_zsh_completer_path="/usr/local/opt/awscli/libexec/bin/aws_zsh_completer.sh"
elif _homebrew-installed && _awscli-homebrew-installed ; then
  _aws_zsh_completer_path=$(brew --prefix awscli)/libexec/bin/aws_zsh_completer.sh
else
  _aws_zsh_completer_path=$(which aws_zsh_completer.sh)
fi

[ -x $_aws_zsh_completer_path ] && source $_aws_zsh_completer_path
unset _aws_zsh_completer_path

For me it's at /usr/local/bin/aws_zsh_completer.sh. I just installed oh-my-zsh from scratch, so maybe that's the current default location..

Yeah - this falls back to $(which aws_zsh_completer.sh), which will pick up /usr/local/bin. The issue is that running brew --prefix in login scripts is brutally slow, so I'm hardcoding the common paths to avoid calling brew. It's mac specific and will be ignored on other platforms.

Thanks for this. I was finally able to reduce oh-my-zsh startup time by a couple of seconds. It had been haunting me for a good year+.