### Creating the `Settings` only once with `lru_cache`

Reading a file from disk is normally a costly (slow) operation, so you probably want to do it only once and then re-use the same settings object, instead of reading it for each request.

But every time we do:

```Python
Settings()
```

## 0.28.0

* Implement dependency cache per request.
    * This avoids calling each dependency multiple times for the same request.
    * This is useful while calling external services, performing costly computation, etc.

* the contents your program gave to the system to be written to disk
* a remote API operation
* a database operation to finish
* a database query to return the results
* etc.

As the execution time is consumed mostly by waiting for <abbr title="Input and Output">I/O</abbr> operations, they call them "I/O bound" operations.

    * Dowiedz się, gdy ogłoszę coś nowego lub wypuszczę nowe narzędzia (chociaż częściej korzystam z Twittera 🤷‍♂).
* Czytaj moje posty (lub śledź mnie) na <a href="https://dev.to/tiangolo" class="external-link" target="_blank">**Dev.to**</a> lub na <a href="https://medium.com/@tiangolo" class="external-link" target="_blank">**Medium**</a>.

                """
            ),
            deprecated(
                """
                "openapi_prefix" has been deprecated in favor of "root_path", which
                follows more closely the ASGI standard, is simpler, and more
                automatic.
                """
            ),
        ] = "",
        root_path: Annotated[
            str,
            Doc(
                """