IPFire 2.17 Core Update 96 release introduces some important Ramdisk usage changes, such as the use of persistent storage for storing the databases on which the system data is collected and those beautiful graphs are generated.
However, the new persistent storage will only apply to fresh installations of the IPFire firewall, as well as upgraded systems that have less than 512MB RAM. The old, round-robin-based behaviour for databases will be kept for the existing systems with more than 512MB of RAM.