[PaulHoule]

How about having N base graphs and the ability to make unions of the graphs, as well as other kinds of algebra.

It is relatively easy to do this in the RDF world since the graph is composed of individual facts which may or may not be in a particular graph.

[mhuffman]

Which triplestore are you using that gives great front-end performance at load?

[PaulHoule]

None of them are really "great". I get acceptable results with OpenLink Virtuoso if I give it a lot of RAM, tweak the configuration, and baby it when needed.