The memory/disk is actually a huge difference for durability and a really important factor when making a decision to use a database. I believe it would be good to mention it in the benchmark for fair comparison.
Yes, good point, but both Neo4j and Memgraph(https://memgraph.com/product) are ACID-compliant and have on-disk persistent storage. Memgraph is currently RAM constricted, while Neo4j is not but it is hungry for RAM.
Is the comparison using on-disk persistent storage of Memgraph? The facts that they're both ACID-compliant and you can backup the data to disk in Memgraph are not relevant IMO considering the fact that I/O is the main driver for the latency for most of the workloads and reading data from disk is much slower compared to memory. Not sure how Neo4j works but an alternative might be running Neo4j in-memory mode.
No, currently, Memgraph is loaded 100% in RAM. Agree with the point about latency regarding I/O. The story with Neo4j is a bit more complex one. They are loading graph in memory, and using disk storage, doing both. But take a look at memory usage from them, it is the magnitude higher then Memgraph.
