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# PHImageRequestOptionsDeliveryMode.fastFormat

Photos provides only a fast-loading image, possibly sacrificing image quality.

```
case fastFormat
```

## Discussion

Photos calls your `resultHandler` block once. If a high-quality image cannot be loaded quickly, the result handler provides a low-quality image. Check the [`PHImageResultIsDegradedKey`](/documentation/Photos/PHImageResultIsDegradedKey) key in the info dictionary to determine the quality of image provided to the result handler.

This option is available only if the [`isSynchronous`](/documentation/Photos/PHImageRequestOptions/isSynchronous) property is `false`.

---

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