Given the 1000+ search results for "slow" and given that people have for years been reporting extreme CPU lagging with even basic tasks, are you planning to overhaul the slow-moving barge that Lightroom has become, instead of applying new coats of paint to the same dinosaur?
Just an example : today it took me 5+ minutes to export 10 b/w images (using smart previews). I have tried everything that this forum recommends. The problem appears to be a fundamental one. The more you upgrade this app, the worse it becomes.
Currently using Bridge to sort/edit/grade my images. Seriously considering moving everything to Capture One, which is made with photographers in mind.
Pay attention to what people are telling you.
Mac OS Catalina 10.15.5 Retina, 15-inch, Mid 2015 2,5 GHz Quad-Core Intel Core i7
AMD Radeon R9 M370X 2 GB
Crash or freeze, Import and export, Mac, Performance