[krato]

Since no one's mentioned it yet, another alternative to Neo4J is AllegroGraph (though you need to pay for it; the free version supports 5 million tuples).

It _does_ support bulk loading, with over 500K triples per second. According to http://franz.com/agraph/allegrograph/agraph_benchmarks.lhtml, given enough RAM, it can load over a billion tuples in just over half an hour.

[jerven]

Virtuoso 7.1. and OWLIM 5.5 have similar loading speeds. In this case the decompression algorithm is often the bottleneck needing multiple files to be read in parallel to go faster. Oracle 12c Semantic Network and Yarcdata uRiKA can also go faster in loading if correctly set up.