I have been using Drupal for a while to build medium to large CMS systems; love it. From time to time I have to build a RestAPI. Usually I use either Laravel, Lumen or Slim. The only reason why I don't use Drupal is because the bootstrap / overhead is so high in Drupal.
What can be done to make this bootstrap / overhead less. I fully understand that we will never get to the same lean and mean footprint that you get from a dedicated RestAPI framework - but surely we can make the bootstrap faster / smaller / quicker?