Deleted thousands of photos from Photos library, and the size is the same
Solution 1:
Photos does not reclaim disk spaces immediately after you empty the Recently Deleted folder. Keep Photos opened and allow it to reclaim the disk space. It does take some time. I believe that they are the image caches, thumbnails, indices for searching and all other metadata files being cleaned up in the background. There are a lot of layers to how the photos are stored, so there is a lot of different files to clean up. I'd connect to the ac power and just don't let your disk or computer go to sleep.