In addition to my previous comment I would like to add that RedisGraph memory usage is proportional to the size of the graph stored, AFAIK Neo utilizes disk as

In addition to my previous comment I would like to add that RedisGraph memory usage is proportional to the size of the graph stored, AFAIK Neo utilizes disk as the main storage, however the Java VM may have objects in memory in order to traverse the graph, so may also use some memory. I've never tested the memory usage difference between the two, but it should be an interesting test to perform. Generally speaking it seems like a common practice now days to load large portions of your data from disk to memory for performance reasons obviously, no one is willing to pay the penalty hit of disk seek when it comes to real time data querying.