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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 {module}.routing.yml files?
You can use
drush ev '\Drupal::service("router.builder")->rebuild();'
to rebuild the routing information without clearing all the caches.
An alternative to drush is drupal console, which you can then use as:
drupal router:rebuild
Which is a little less typing than the drush ev answer (and a tinsy bit faster, too).
To install drupal console
curl -LSs http://drupalconsole.com/installer | php
mv console.phar /path/to/a/suitable/bin/drupal
drush cc router
when using drush 9 do the trick now :-)
