More info again, still hoping someone can help:

I tried to replace the DAL query with native app engine code.

Original DAL:

            query=(
                (mydb[record].application == application_id) &
                (mydb[record].entity == entity_id) &
                (mydb[record].is_deleted == False))
            
            result = mydb(query).select()

Native:

 from google.appengine.ext import ndb
            class record(ndb.Expando):
                pass
            result = 
record.query().filter(ndb.GenericProperty('application') == application_id, 
ndb.GenericProperty('entity') == entity.id, 
ndb.GenericProperty('is_deleted') == False)
 
I was hoping this will speed things up, but it did not. It was the same 
slowness on the local dev env. On the server, the situation became even 
worse:

"While handling this request, the process that handled this request was 
found to be using too much memory and was terminated. "

Anyway, I still find it unreal that a query of 800 rows can last more than 
20 seconds. 

Ideas are continue to be most welcome.
  

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