Performance problems can have MANY sources.
First, check to see if there are performance-related fixes in newer versions of CMOD. (This depends on which version you're at today.)
Second, check to see that there aren't any CPU limitations (other processes using all your cycles).
Third, check for memory utilization for the database. Earlier versions of DB2 had very low default values for DBHEAP, etc.
Also, in French, a 'byte' is an 'octet'. So a Megabyte becomes a Megaoctet, or "Mo". Ko = Kilo-octet, Go = Gigaoctet, etc. Hope that helps!
-JD.