No, that topic was outside of the scope of the book. In truth, it's really still being researched by the Seam developers. You may be interested to know that Seam is currently undergoing three rigorous reviews: a security review, a performance review, and a scaling review. The heavier emphasis is on the first two since the last one is more of an architecture concern than a code quality one. I know for a fact that the Seam team has planned a discussion with Terracotta to begin working on integrations. Of course, Seam itself, given that it can be used in "EJB-mode" benefits from any scaling available to EJB containers. In fact, the later is probably your most mature approach at this point.