What storage backend do you use? Do I understand right that the storage backend and the load script all run on the same server? If, so, are all available CPU resources actively used during batch loading? What is CPU usage of the groovy process and what of the storage backend?
Specific details in the script:
did you specify storage.batch-loading=true
I am not sure whether each traversal() call on the graph gets its own thread-independent transaction (that is why ask for the groovy CPU usage). Maybe you need g = graph.newTransaction().traversal() in CsvImporter
I assume that the global GraphTraversalSource g at the bottom of the script is not used for the bulk loading.
