Your slow down seems totally expectable. It's spending most of the time locked or waiting for db. You can of course make sure you don't do things that prevent tables from being lazy but there's not much you can do about the slowdown from concurrency apart from tuning your database, did you set the pool_size in your Dal? What I would do, if possible, would be to aggressively cache as much as possible so you avoid hitting the DB so much. Think about what is really important to be realtime updated, maybe somethings can be 5 minutes out of date and you can cache that select.
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