# Function to determine the need of a zcompile. If the .zwc file
# does not exist, or the base file is newer, we need to compile.
# These jobs are asynchronous, and will not impact the interactive shell
zcompare() {
  if [[ -s ${1} && ( ! -s ${1}.zwc || ${1} -nt ${1}.zwc) ]]; then
    zcompile ${1}
  fi
}

emulate zsh -o extended_glob -c "local files=($ZDOTDIR/*.zsh)"
for file in "${files[@]}"; do
  zcompare $file
done
zcompare .zshrc