Allocation optimizations

[carpawell]

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

I'm always frustrated when a storage node does not store objects fast. Some profiles say it allocates a lot. Because of the different things.

Describe the solution you'd like

Do some object marshaling optimizations (the list is extendable):

1. Do not (un)marshal an object if a node reads it for replications only; just stream it as is;
2. Do not sign a message more than once during the initial object distribution (for REP N without a local copy, a node will sign and send the same message N times);
3. ...

Describe alternatives you've considered

Look at profiles, get used to profiles, love profiles.

[roman-khimov]

The first one is #2317. I'd say this one is for the second.

[carpawell]

@roman-khimov, did not know #2317 exists. Initially planned this issue to be a general issue with some discussion. Can be reworked/renamed.