Hello Thomas, 

Reproducing your code with Datastore access, I can see access times in the 
order of 200 to 300 ms, but for only one write and one final read. By 
contrast, your code accesses the Datastore for 28 times at each request, 
and it is there that the difference in timing is generated. Your 
application writes data in the Datastore and immediately reads it to 
eventually return it to the user via the servlet’s get request. This is 
time-consuming. Data may be cached 
<https://cloud.google.com/appengine/articles/scaling/memcache> in Memcache 
and saved asynchronously by a separate background process. 

If you are using the Datastore, Google recommends 
<https://cloud.google.com/appengine/articles/scalability> that you design 
your application so that it will not need to update an entity group more 
than once per second for a sustained period of time 
<https://cloud.google.com/appengine/articles/handling_datastore_errors>. 
There is no difference in performance between the current version of the 
flex environment and previous ones. 

Trying various combinations for the config parameters of the 
appengine-maven-plugin, I do not encounter any error. You may consider 
re-checking your local networking parameters. Providing more detail on the 
matter should bring more clarity. 

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  • [google-appengine]... 'George (Cloud Platform Support)' via Google App Engine
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