Git 2.8.0 released
One of the relatively cryptic parts of the release notes is:    * Update the untracked cache subsystem and change its primary UI from
      "git update-index" to "git config".

This is a feature we worked on, it means that you can do this:    $ sudo git config --system core.untrackedCache true

And have [core] untrackedCache = true written to
/etc/gitconfig. This'll speed up "git status" and similar index
operations significantly.I've seen "git status" times go from ~400ms to ~200ms and from ~140ms
to ~60ms simply by setting this.It could be set via "git update-index" in previous Git versions on a
per-repo basis, but not on a system-wide basis, this makes it easier
to e.g. puppetize it.