Doing it in one line sounds like accessing a single cache slot at a time. We found we're a lot better off collecting the set of cache slots we need and then fet

Doing it in one line sounds like accessing a single cache slot at a time. We found we're a lot better off collecting the set of cache slots we need and then fetching them all in parallel, rather than waiting until we have the result for slot #1 before we can even start the request for slot #2. Every transaction is at least two context switches, sometimes worse.