* inspired by #2686 (comment)

Is your feature request related to a problem? Please describe.

in some scenarios ObjectService server of the storage node calculates list of container nodes again and again for fixed network map (epoch stays unchanged for some period of time) and container (e.g. data load into single container)

this is easy observable from profiles attached to #2686. Millions of objects may be uploaded into single container within one epoch, and node will do https://pkg.go.dev/github.com/nspcc-dev/neofs-sdk-go/netmap#NetMap.ContainerNodes millions of times

Describe the solution you'd like

cache the results. Cache should have limited size ofc (it's enough to start with fixed size LRU cache). For some placements like "the latest epoch" the cache must be invalidated on epoch switch

Describe alternatives you've considered

no other ideas for now