Thank you for the info. Where can I find where my ACR cache is stored? Did you meant Camera RAW cache? If so, it's on my C drive (SSD also) and set to max 10 GB. BTW, my disks are:
c: 128 GB SSD (for OS)
d: 128 GB SSD (for LR)
F: 5TB RAID 6 (LSI 9260 controller storage)