# Cache responses Caching in backend development plays a pivotal role in sustainable system design. By storing frequently accessed data in a cache, the system can respond to user requests more swiftly. This means reducing the need for repeated processing and resource-intensive database queries. This efficiency optimization aligns with the principles of sustainable design by decreasing the strain on hardware and minimizing energy consumption. With cached data readily available, the system can reduce its reliance on constant data retrieval, resulting in shorter response times and improved user experiences. By mitigating unnecessary resource usage and enhancing overall system responsiveness, caching contributes to a more sustainable software ecosystem. The result will be software ecosystem that operates efficiently and conserves resources, while still delivering high-quality user experiences. With Umbraco's Delivery API it is possible to use output caching to increase a website's performance. You can read more about this in the [Output caching](https://docs.umbraco.com/umbraco-cms/reference/content-delivery-api/output-caching) article. --- # 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.umbraco.com/sustainability-best-practices/backend/cache-responses.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.