the Saving Metadata progress bar appeared but didn't move
Lightroom Classic release 15.0.1 introduced incredible sluggishness. Most noticeably, when I tried to Save Metadata to File for 325 NEFs that are about 30MB each, the Saving Metadata progress bar appeared but didn't move. After about 20 minutes, I canceled the operation with one XMP file created in the catalog folder containing the 325 images.
Note: we're a Windows 11 Pro shop, and my catalog has 88,000 photos. Huge, but this caused no noticeable performance issues before this release.

