I've only used LrC for film photo scans (JPG) prior to this, where pressing "\" (backslash) key to toggle between before and after was nearly instantaneous.
I imported a bunch of digital camera .dng's today and noticed that when working on .dng files, the "\" before-vs-after toggle takes 1-2 seconds to finish. My cursor would spin the rainbow beachball while LrC is at it.
Is this normal? I don't know why it'd would spin for a couple of seconds to for .dng files.
Platform: macOS Monterey 12.5