UPDATE:
The bid is $60, first milestone, and please ignore the deadline.
Hello! I'm wondering still what you're code does? I found the CSV file, 1 only. Kindly attach the code, sample input and output files.
Regarding timing:
If anything is taking so long in order of days, what's causing that issue? Is it sone mathematical operations, some optimization problem, just reading your data... what exactly is it causing the delay?
About R
As you might know R is built in the motivation that it can handle any size of data and is fastest among any other tool in the industry, simply because it works on RAM entirely. So, if you've enough RAM, using R is the fastest way around. So, talking about memory efficiency, there's hardly anything can be done if you're using an already optimized library.
Solutions:
Did you try batch processing? or parallelization of the code? If that's even possible or not?
Anyway, message me and we can discuss the issue in detail. Thanks!