I read somewhere that IN queries are processed serially by the datastore. GOOGers, what is a rough rule-of-thumb on the benefit of using IN? For example, if the base RT latency for anything with the datastore is Nms, then could guesstimate that using N for a list of 3 is not a huge latency win, but using IN for 10 is. Does using IN substantially cut down on the api_cpu_ms used vs sequential queries?
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