git fetch --recurse-submodules asynchronously.
git fetch --recurse-submodules asynchronously.

See https://git-scm.com/docs/git-fetch#git-fetch---jobsltngt
and https://git-scm.com/docs/git-config#git-config-submodulefetchJobs

jesperronn/cowboy-dotfiles,jesperronn/cowboy-dotfiles,jesperronn/cowboy-dotfiles,jesperronn/cowboy-dotfiles