Arun Sirpal diagnoses a slower-than-usual DBCC CHECKDB run:
All the signs of CHECKDB Latch contention.
DBCC – OBJECT – METADATA this latch can be a major bottleneck for DBCC consistency checks when indexes on computed columns exist. As a side note DBCC_Multiobject scanner is used to get the next set of pages to process during a consistency check.
Read on for the details and Arun’s solution.