Is there a way to return "Drupal root" value that is faster than running drush status? I'm trying to add something to my shell that shows the current Drupal root value so that we can use drush use more, but the only way I can see to return the current Drupal root value is to run drush status which is quite slow
cd /path/to/drupalroot/sites/default
drush drupal-directory '%root'


On the old system I'm on right now, that clocks in at 3.5s, vs. 11.8s for drush status

If you are using site aliases, as tenken suggested, then you can do this:

drush sa --format=csv --fields=root