I do not know if this is a coincidence or not, but in corsairs to each his own, the same drop in performance on the last beta release. And the engine there is also compiled for 2019 studio.
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Good to hear. I already had the 2017 ready to upload at a moment's notice if it was still a problem, but it sounds like I can continue moving forward with 2019 for the x64 bit. The 32 bit still uses 2017 because Microsoft has deprecated XP support in the newer VS2019 toolkit (I think you can configure to continue using it, but it is more work than I deem worth the effort) and it is simply easier to keep using 2017 for those 32 bit versions because I want them to remain compatible for WinXP.