Grid thumbnails slow to load even after building standard previews for all images
When I load a selection of images into the library grid based on a metadata search, the thumbnails are ridiculously slow to load. I have built standard previews for ALL images (took days). Yet the behavior is exactly the same as before I built the previews. When I scroll the grid, the new set of images has no thumbnails and each one takes ~ 1 second to load. That's absurd. It seems Lightroom is building the thumbnails on every load rather than caching them. Is that true? How do I retain the thumbnails between sessions or searches? Why doesn't building previews help with loading thumbnails?
This is NOT a hardware issue. So please don't spam me with "you need faster hard drives" or "you need faster processors". Every bit of my setup is fast from local workstation with RAID 0 SSD's to 1Gbps NAS image storage.

