Welcome to the forum!
Some remarks:
- please, enclose any code you share in triple back-ticks like ```
- if you call a function the first time it gets compiled, so call it a second time to determine the execution time
- avoid global variables if you need fast execution time
Finally, in this line:
allScans[:, :, ii] = readdlm(joinpath(file_location, file))
try to replace = with .= to avoid allocations.
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