This document discusses modeling workbenches and Sirius, an Eclipse modeling framework. It provides tips for creating efficient and scalable modeling specifications in Sirius. Key points include using the Acceleo Query Language (AQL) for semantic element queries, considering model topology to improve performance, and leveraging styles, layers, and viewpoints to customize appearances and control visibility. Advanced tools and mappings can enhance user interactions. Overall, the presentation emphasizes optimizing Sirius specifications through semantic queries, visualization techniques, and usability features.