If a Roon storage folder is not updating after you have added music to it then you should open a thread in Support and provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so they can have a clear understanding of how your devices are communicating.
The speed of audio analysis of new music depends greatly on whether you are using an SSD or spinning hard drive and the power of your CPU.