The EMPAIA Development Team has released an incremental update of the EMPAIA App Test Suite (EATS). The new version includes an updated Generic App UI for research and development, with support for multi-RoI job inputs. The release also includes major performance improvements when writing bulk data in the Medical Data Service. This facilitates the development of “preprocessing” Apps that analyze a full WSI and produce large annotation collections. The full documentation is available in the EMPAIA Developer Portal.