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Parallel ActiveRecord Queries with load_async in Rails 7 Discussion

Are there any downsides to using load_async on everything if we know for a fact that we’ll be using the data during the request? It seems like a no-brainer if we can keep db connections in check?

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It depends on how many threads you can handle on your system. So I would imagine there is probably an upper limit. They addressed this in the PR https://github.com/rails/rails/pull/40037#discussion_r571920259

Basically, having it as default might lead to unintentional consequences. Whereas, using it for queries that are exceptionally long might be the best fit for it.

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it looks like the async queries saved time on the front end ..... but didn't that cost get paid on the backend? I'm unclear where the savings comes from ? And, are these queries cached in some way such that ensuing requests that contain those same queries would absolutely be faster?

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