Specifies a policy to control the loading and unloading of the image. The two common policies are PreloadRetain, the default which loads images at startup and keeps them loaded, and UnloadUnused which keeps only used images loaded.

For dynamic images, such as those coming from HTTP, you should use the UnloadUnused policy, otherwise you'll continue to consume more memory as more images are loaded. For example:

<Image Url="{imageLocation}" MemoryPolicy="UnloadUnused"/>