Automatic DLL loading of razor templates is a fancy way of saying that website razor templates are now cached for faster site restarts.

Pre-compiled templates are stored in memory for quick loading whenever a site needs to be restarted (such as after upgrades and server maintenance). Any time a template is updated it gets automatically re-cached so that files are always up-to-date.

An additional benefit for sites hosted in Azure, which have auto-scaling enabled, this will now too allow for the scaling to complete faster..