UriImageSource questions

Hi All,
I'm new on Xamarin form development, and I have a question about UriImageSource caching.

I have a simple custom CellView that contain an Image and that I bind in this way.

GalleryLogo.SetBinding (Image.SourceProperty, new Binding ("ImageURL",converter:new PlaceHolderConverter()));

My question is about how caching work , seems that always load image from file and this slow down list scrolling.
But if i want to keep in memory some images for speed up list scrolling and avoid to reload from file is possible?.

Thanks a lot.