Since you're looking at readonly stuff, one of the faster ways I've found is to write a view on the database and create a sqlalchemy classes for it. That lets you customize and tweak the exact query for performance on the server, SqlAlchemy essentially "selects all" from it, and then you do the "to_json" trick Michael mentioned. You can also do things with CORE to further minimize the logic/mapping layer, but I've found the "view" trick to get 90% of the performance benefits with 10% of the work, and it's easier to maintain.
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