Practically
speaking it more than likely will not matter until the data sets get
large however as a "best practices" go it is best to keep the data
consistent and in the type that the control,
property node etc expects. Directly from the NI user manual (
LV 7.1)
"Coercion
dots appear on block diagram nodes to alert you that you wired two
different numeric data types together. The dot means that
LabVIEW
converted the value passed into the node to a different representation.
Coercion dots can cause a VI to use more memory and increase its run
time. Try to keep data types consistent in
VIs."
Cheers,
--Russ