I am NOT an expert on memory management.
However, there is a way to force LabView to do memory clean-ups
at specific points in the program. There is a "GrowZone VI" on the
ftp.natinst.com site that cleans up the data space.
I found that using this VI helps to let LabVIEW run with
consistent performance. It might be wise to ensure strict data dependency
when this VI is used.

Ralf Schoepfer