Hydra doesn't ship data to the client in order to then do further work like aggregations -- that's the whole point of Hydra -- but that also means that you won'

Hydra doesn't ship data to the client in order to then do further work like aggregations -- that's the whole point of Hydra -- but that also means that you won't be able to "workaround" a performance issue with an underlying data store. For that, we'd need to find a way to replicate the data to a data store that can solve the aggregation performance issue.