"Average fetch time" is an indication of how long it actually takes MVS™ to perform a load from the partitioned data set in the RPL concatenation into CICS® managed storage.
The average for each RPL offset of "Program size" / "Average fetch time". is an indication of the byte transfer rate during loads from a particular partitioned data set. A comparison of these values may assist you to detect bad channel loading or file layout problems.
For more information, see the CICS statistics tables in topic Program statistics.