I have a root entity and several child entities mapped using owned one
to many relationships. When a new entity group is created put
operations in that entity group use reasonable amounts of CPU (1
second), but as the number of entities in that entity group increase
so does the CPU used for put operations. Now I'm seeing over 40
seconds CPU used for put operations on entity groups with over one
thousand entities. And it continues to increase.

Child entities have few custom indexes (about 5), but this doesn't
seem to cause the problem, because it takes about the same amount of
CPU (over 40 seconds) for a put operation on any entity kind, even for
a first put for a specific entity kind.

I've read all App Engine articles and watched all videos but I still
can't figure it out. I would really appreciate some help.

Thanks,
Lucian
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