Thank you all for your comments.
altenbach: the workaround
OrderAnalysis-2aInterpolacion_revCAFast.vi works fast enought for me

However, what you and also other did was to made the code more efficient (something that I should also try to do!), so that it run faster. But from the LV version point of view I still don't understand the difference of execution time.
once again, thank you all