Open vi by reference is very slow

Hi !
I have this main vi which is the user interface and it calls several
subVIs sequentially (subvi 1, subvi 2, subvi 3 etc). the subVIs in turn
have subVIs which belong to a DLL, I chosen to use CALL VI BY REFERENCE
since my sequence is not fixed. when i run the main VI however, the
time taken seem to be much longer than what it should be.
One observation which I made was that when I have one of these SubVIs
opened. The main VI runs smoothly and can be completed in a matter of
seconds. What can I do to run this Main VI smoothly and efficiently
without having to open my SubVI ?
Goy

Hi
thank you guys for your reply. I think that its a good idea to
load the subVIs first by placing them in a non executing section. allow
me to describe the program in a little more details simply for
completeness
Layer I Main VI (also the user interface)
Layer II Sub VIs (a series of VI which are dynamically called)
These VIs are actually test cases. I made them dynamic because I have
huge set of different tests and each time I run the main VI, I may only
call a few of them to run. Thats why I chosen it instead of using a
state machine. It works fine for me.
Layer III Hardware Drivers (VIs which interface directly to hardware)
These VIs are called by the subVIs in layer II. I had collectively put
these VIs into DLL for easier organisation. I believe the additional
time taken was actually due to loading the VIs from the DLL in this
layer.
question : what can I do to let the Main VI in Layer I to
know that I be using VIs from Layer III ? is there a way to include DLL
into any VI to let it know it will be loading these VIs. As suggested,
one way of coz is simply to put a VI which reside in the DLL into a non
executing part of the main VI. I shall try next week when I get back to
work.

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