CHGPF taking long time

V5R4 thru cume 06192
Have a lib of 10,000 files, each 20-100 records, all 
based on same dds. Expanded a number of alpha fields, 
none shorter, none dropped. No triggers or constraints.
It is processing about 3 files a minute (which makes
this a VERY long run, in batch. No contention for the 
files. I can see in job stack it is spending lots of 
time appearing to check for triggers & contraints.
This is much slower than it used to be. I have previously
processed the same file set, similar change, in a few hours,
not 55 hours.
QDBCHGFI   QSYS          16304             QDBCHGFI                    
QDBCHGFI   QSYS          3719              QDBCHGFITR                  
QDBTRDEP   QSYS          2884              QDBTRDEP                    
QDBTRDEP   QSYS          3278              DROPDEPENDENTTRIGGERS       
QDBTRDEP   QSYS          3469              GETDEPENDENTTRIGGERSBYQUERY 
QDBTRDEP   QSYS          3746              OPENQUERY                   
QSQROUTX   QSYS          6402              QSQROUTX                    
QSQROUTX   QSYS          15308             XTPROCES                    
QSQRUN3    QSYS          11754             SQL_Open                    
QSQRUN3    QSYS          16146             OPQRYDBM                    
QSQRUN3    QSYS          22920             FULL_OPEN 

jim franz