I\'ve checked several related questions such is this
How to load data quickly into R?
I\'m quoting specific part of the most rated answer
The main reason why RData files take a while to load is that the de-compression step is single-threaded.
The fastSave R package allows using parallel tools for saving and restoring R sessions:
https://github.com/barkasn/fastSave
But it only works on UNIX (You should still be able to open the files on other platforms though).