Is fetching an object by String key be faster than a Key key? (GAE/J)

Question

Thats pretty much the question. Are there any other concerns i should be aware of?

Answer 1

The only criteria in the documentation that I can find is on whether to use non-Key or Key is whether you have Entity Relations. If you do use Keys.

Answer 2

No. Fetching by key is faster than querying, but it doesn't matter what form the key is in.