After the acquisition of a99-2 LR became unbearably slow to process even JPG files. The size has doubled ... Found a simple way out, installed the previous versions of 5.7 and 4.4. And a miracle was accomplished! The computer came to life again.
(i7, 32gb RAM, 250 Samsung SSD - sata III)
To convert RAW to JPG I use C1 Capture One Express, which works much more correctly and very quickly with RAW files. Further processing, if necessary, can be completed in Adobe.