During work on my project based on AppEngine I have made a mini benchmark of the datastore.
The operation under the test was update of the object in the datastore, and read object by the key from the datastore.
Both operation took from 20 to 40 milliseconds. It is not that fast. It mean that usual web service can not make more then a few access operations during request serving. Taking into account lack of muftithreading this latency makes problematic building complicated web applications build from the different services.
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