Dekyll – Drupal on Jekyll: Even coupled CMS is going decoupled these days.
Drupal is no doubt one of the best CMS out there; Jekyll is no doubt one of the best static site generators out there. See where I’m going? And it’s no longer just a concept, it is a complete installation profile called Dekyll.
Write your Drupal out to static HTML. Serve it up using any CDN, basically. Even something like DropPages or an S3 bucket, or – in Dekyll’s own case – Gitlab.