Windows server 2019 speed issue (native DF DB on local server drive.) are there any system settings we should be checking ?
DF windows application compiled with DFv17 or DFv20.1 makes no difference.
For comparison we have used identical AWS server sizes.

Note:
1. Windows server 2008 works fine...
2. Windows server 2019 is 6x slower... (i.e. Windows server 2012 or later)
3. We have tried DF v17 or v20.1 versions of the same program (32 and 64 bit)

Apologies if this is addressed elsewhere, or I am missing something fundamental.
Thanks