# Advanced - [Saving and Restoring app state](https://docs.fabulous.dev/advanced/saving-and-restoring-app-state.md) - [Performance optimization](https://docs.fabulous.dev/advanced/performance-optimization.md) - [Composing larger applications](https://docs.fabulous.dev/advanced/composing-larger-applications.md) - [Splitting into independent MVU states](https://docs.fabulous.dev/advanced/composing-larger-applications/splitting-into-independent-mvu-states.md): Learn how to break down a big app into several smaller programs with View.map - [Integrating commands](https://docs.fabulous.dev/advanced/composing-larger-applications/integrating-commands.md): Learn how to use Cmd.map and Cmd.batch to compose Cmds from independent MVU states - [Communicating between MVU states](https://docs.fabulous.dev/advanced/composing-larger-applications/communicating-between-mvu-states.md): Learn how to use the Intent pattern to communicate between independent MVU states --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.fabulous.dev/advanced.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.