The CSS SQL Engineers have a new series called “It Just Runs Faster.” In their first post, they discuss DBCC improvements:
Internally DBCC CHECK* uses a page scanning coordinator design (MultiObjectScanner.) SQL Server 2016 changes the internal design to (CheckScanner), applying no lock semantics and a design similar to those used with In-Memory Optimized (Hekaton) objects, allowing DBCC operations to scale far better than previous releases.
Making DBCC checks significantly faster for large databases makes administration that much easier. I’m looking forward to seeing this. James Anderson, however, is concerned that things might be worse at the extreme low end.