Volume limitation in the bus

We have already worked on the volume limitation in branch data-volume-limitation.
The object size_of() method is used, however too much time consuming.
We need to check this method, maybe find another library or another method to do it.
Explain the 1.8 coefficient and look further into the fragmentation part of the code.

Post Consumer + Upload = special, need to be limited at the beggining?

Start by reviewing the existing work in branch data-volume-limitation and trace the object size_of() method used by the bus volume limit. Document what the 1.8 coefficient and fragmentation logic represent, investigate the reported time cost, and clarify how Post Consumer + Upload should be limited. Done means the limitation behavior and performance approach are agreed and verified.

Written by the indexing model from the issue text.