Having worked with Drupal 7 since its launch, I'm learning Drupal 8. At the moment I'm finding that whenever I change anything I have to do
drush cache-rebuild to get things working again.
On my VPS this takes 15 seconds (and then the next page load also is slow). I have a feeling this may be a sledge hammer to crack a nut situation.
Is there a more efficient way to get Drupal to recompile the (changed) routes from