Why is labview so slow when I use an array subset to scan through a large array

I am using an array sub set to scroll  arrays across an intensity graph, and it works but when I load a large array (ex. 482 x 1000) the program is extremely slow, updating appox. every 3 seconds. What I'm I doing wrong?
- there is always an easy way, but it is always the hardest to find

Can you attach your code so we can see how you do this?
How big are the subsets you are extracting?
LabVIEW Champion . Do more with less code and in less time .

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