If the multivalues have many many values, and you are adding to the end, then a 
speed up may be possible.

MATREAD in the data, RAISE those array elements you are changing.  Before the 
MATWRITE, LOWER all array elements you raised.

As I understand it, Universe keeps internal track on attributes, so processing 
these in ascending order is a LOT faster than it used to be.  However this is 
not done for multivalues (space considerations?).

Regards, Keith

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