LrC becomes unusable when building 1:1 Previews from DNGs

Latest version as of this post.  Anecdotal context. I imported about 500 Sony ARW lossless compressed files from a Sony A7RV using Copy as DNG and 1:1 Previews selected. The import and conversion to DNG took maybe 10-15 minutes. The previews took 45 minutes to build, during which time Lightroom became absolutely unusable. I could not even click on cancel without an unresponsive warning from windows.

PC Specs:
AMD Ryzen 7950X

64GB Ram

A 4TB WD Black SSD's dedicated to photos (about 1/4 free) 

Anecdotes
- I previously ran Denoise on a batch of over 350 images, which took about 20 minutes and LrC was still usable for editing.
- I have not noticed this issue previously, though I usually don't convert to DNG

[Moved from ‘Bugs’ to ‘Discussions’ by moderator, according to forum rules.]