[LF] File or array?

[Lahey Support]

I have a file that contains data that i will use during the execution of the
program. I am curius what would be faster: to open the file once read all
the data and store them during execution in an array or whenever i need
something from this file to open it get the values i need close the file (or
maybe leave the file open during execution) etc. without commiting an array?
Thanks.

Dora Avanidou