Thanks! Structr is actually much more than a CMS; it has evolved into a Rapid Application Development Platform with a visual schema editor and an integrated JSON/REST server, so it can even be used for database-as-a-service projects etc.
On the CMS side, the page rendering process is a graph traversal and thus very fast (just a couple of milliseconds), and Structr doesn't need any caching of intermediate results during page assembly, so it can render protected/private pages as fast as public ones.
And you can create mobile backends and web apps in minutes, using the schema editor to define a custom data model.