iOS Consume more memory than Android

## 💬 Questions and Help

I'm trying to download 20 images from the server, which is just 17 MB in total. However, the RAM uses up to about 200 MB in iOS, whereas on an Android device, it only uses 100 MB. I'm downloading each image using the download method.

```
final futures = collections.map(
(e) => DefaultCacheManager.downloadFile(
e.url,
key: e.id,
),
);
await Future.wait(futures);
```

No source files, tests, or entry points are identified. Start by reproducing the download of 20 images with DefaultCacheManager.downloadFile and compare iOS and Android memory usage; done means identifying and documenting a reproducible cause or fix for the reported platform difference.

Written by the indexing model from the issue text.