There is a number of cases where we can optimize the memory consumption.

• After SDK move all IDs should be passed by value where possible
• Fix/Do not use Prm pointers in Storage Engine #1418
• Fix/Do not use Res pointers in SE #1460
• Try to use metabase transaction context #1260
• Optimize object transformer pipelines: for a single object we consume C * size(object), ideally we'd like to have C = 1, using streaming interfaces, each separate transformer could be profiled
• Restrict the amount of concurrent service connections, return ErrBusy
• Support simple versioning for the metabase #1483
• Support simple versioning for the writecache #1501
• Do not use base58 strings as keys in the writecache #1473
• Do not use base58 strings as keys in the metabase #1482
• Optimize meta.ListWithCursor #1516

Anything else?

Related #1319 .