Do i have to close reference after open?

Hello,
i have one vi that Opens & Starts 10times in a loop the same vi (see picture).
This vi is running very fast and is restarted each second by the calling vi.
Currently there is no "Close reference" at the end of all. Is this needed?
If yes: What is the consequence when running the vi without it?
My current problem is that the CPU usage rises although the program is always doing the same.
Can this be the result of a missing "Close Reference"?
Thx

Neos wrote:
why are you calling your vi in a  loop every time.
Can't you put the while loop inside the called VI.
i do not see wait anywhere in loop so CPU usage will be high.
and yes you need to close references you opened.
He is calling different clone instances of his VI.  That is why it is in a loop (a new instance each iteration).  I'm just not sure why they just didn't use a FOR loop.  The second loop will wait for each instance to complete, so no need to worry about CPU usage.
And yes, you should really close your references.
Closing References in LabVIEW
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