It does uses a lazy list to do asynchronous prefetching:
http://code.google.com/p/googleappengine/source/browse/trunk/java/src/main/com/google/appengine/api/datastore/LazyList.java

On Tue, Jun 7, 2011 at 3:19 AM, Anders <blabl...@gmail.com> wrote:

> I doubt that the difference can be that large. The performance test code
> uses the low-level PreparedQuery#asList call. The question is if the list
> (List<Entity>) contains entities loaded with data or if the list returned
> has a lazy loading implementation so that the actual data from the the
> datastore only gets loaded when entity properties are accessed.
>
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