Unexpected behavior with AutoSync

I can't explain it ut yeah it clearly happens in your recording but I just can't reproduce it and have never seen anything like this even though I edit a lot in Auto Sync mode. I can see your recording and I am going about the same speed with my changes. I highly doubt it has anything to do with how fast you go but it must be some kind of corruption in your catalog file that causes it to behave in unexpected ways. Does this happen with a fresh catalog file? Does resetting Classic's preferences make a difference?

Also, I do not see any of the bad performance people are talking about. My main catalog has ~130,000 images in it most from high megapixel cameras. This catalog has been going since before Lightroom version 1 (I was an early beta tester) and I always just let Lightroom upgrade it. Most images are stored on a NAS and it works as fast as always. Classic just flies on this M1 Max machine but even on my previous intel it always worked just fine. I shoot and edit high volumes of images all the time. I do have some optimizations that I use which is to always import using embedded previews (enormous time saver!) and not let Lightroom generate its own previews. I also have my raw default set to "camera settings" so the embedded preview is actually very close to what Lightroom would have generated by its own. This speeds up initial culling vastly. I also don't use smart previews as they are an enormous time waster to generate and worse do not help with performance on modern machines at all. They might have had a purpose years ago but nowadays they are useless except if you need to edit images that are offline. These two things (use embedded previews and don't let Lightroom generate any other previews) save me hours of time.