So SDL 2019 SR1 is still a 32-bit version? That would possibly explain why it is so paiiiiiinfully slow under Win 10 and Parallels 14 VM? I never had issues under Win 7 and SDL 2014...but the upgrade to SDL 2019 has been disappointing.
Do you actually understand what did you say here?
You are comparing apples with oranges... so the speed difference is NOT caused by 32-bit application, neither by Parallels... but by the difference between Studio 2014 and Studio 2019 SR1!!!
THAT is the core of the speed issues, nothing else.
I would recommend to get more familiar with the under-the-hood significant changes between Studio 2014 and Studio 2019 SR1, especially when it comes to TM lookups and related stuff (fragment matches, etc.), then you would understand much better.