Just curious, I run Windows 10, 64 bit on a VMWare virtual on a MacBook Pro. My FM solution, imports a file using Insert From URL, then parses the file extracting data and inserting in appropriate records and fields, then imports all photos and files directly into containers. On the MacBook pro, up to date OS X and FM Adv, it takes 4 min 45 sec to run. In the virtual machine running Windows, as per above, the same FM solution and FM Adv, takes 4 min 15 sec. So on the virtual machine, it runs faster than on the OS X system.
Would not have expected that !!
It is interesting.
Are all files in VM local disk, or host or network volume?
If not in local and you did it first on OSX ,some file cache is effective for the result.