title: Benchmarks for various Google App Engine Datastore operations?
body: <p>A recent <a href="https://stackoverflow.com/questions/1892325/simple-db-query-on-google-app-engine-taking-a-lot-of-cpu-time">question</a> regarding the datastore and how long a query should run got me thinking - has anyone compiled a nice set of benchmarks that would demonstrate what "typical" results should be for datastore performance?  I know that every entity kind will have different performance characteristics, but it would be great to be able to see times for a few representative types of entities, so we know if we're doing something wrong (for example, if we see that our query is taking much longer than the benchmark, we might know to check for non lazily fetched relationships, or to verify that we are using the api properly to batch fetch things.)</p>