The db4o has announced the release of version 5.5. "This release is a performance release. It uses a new BTree architecture for class indexes to reduce the time for commits dramatically. New marshallers for strings and arrays improve insert and update performance by achieving a better clustering of slots. A new diagnostics package provides more help for developers to develop fast applications. All performance improvements also lead to a lower memory consumption, emphasizing db4o's suitability for embedded use on low ressource systems."