Release version 2.2.0 This release massively improves performance of ARSnova and contains a critical bugfix so it is highly recommended to upgrade. Because of the newly introduced caching method, it might be necessary to increase the Java memory limit for servlet containers. Major features: * Performance improvements: Database queries are now cached by the backend. Answers are written to the database in batches. * Pagination support: The range of results can now be limited. * The API has been extended to support features introduced with ARSnova Mobile 2.2. Bugfixes: * User content consisting of JSON could not be loaded and rendered connected data unloadable as well. This version is brought to you by: Project management: Klaus Quibeldey-Cirkel Lead programming: Andreas Gärtner, Daniel Gerhardt, Christoph Thelen Contributions: Dominik Hikade, Tom Käsler, Maximilian Klingelhöfer, Michael Sann, Jan Sladek, Katharina Staden