Technical aspects of OS X file server access performance

I wonder how relevant this is today (the article is over a year old, and is not clear which version of OS X it is discussing).

As I understand it with Mavericks the default file sharing protocol was SMB2, in Yosemite it is now SMB3. With such major changes in the network stack (caching is one of them), I wonder if the inefficiencies in Finder have been resolved.