There is a difference in performance when running a CA Datacom DBUTLTY EXTRACT and physical BACKUP against the same area.
The EXTRACT is much slower than the BACKUP. It uses more CPU and EXCPs,
Release : 15.0, 15.1
Component : CA DATACOM/DB
The reason the EXTRACT takes longer to run is that it has to uncompress the records first. By default the BACKUP specifies CMPRS=YES which leaves the records compressed in the backup. This is explained in the documentation section Back Up Data Area