asking because i've looked at it a couple of years back and decided to go with SQL but the project looked reeeaally interesting back then and it still might fit for new development.
I also tried it before they had a fast data importer and... well, you need a fast data importer.
Have you already tried http://orientdb.com/docs/last/Graph-Batch-Insert.html?
In case you import data from a RDBMS, you can use Teleporter: http://orientdb.com/docs/last/Teleporter-Home.html.
Contrary to the assumptions of the OrientDB CSV tutorial, my edges are not being exported from a SQL database. The nodes aren't, for example, foreign keys into a SQL table. They don't have sequential IDs. They are just strings that identify the things that the edges connect. This is typical in N-Triples.
The triples are not currently in any kind of relational database, which I think is what Teleporter is about.
With the link to http://orientdb.com/docs/last/Graph-Batch-Insert.html, you seem to be asking me to write my own importer in Java. I'd rather not.