It takes over a minute for the export dialog to come up

Running LrC 15.01 on Mac mini M4 Pro with 64GB of memory and Tahoe 26.1. Catalog is on the main drive with over 300GB free. I have already tried uninstalling and reinstalling LrC. I also tried factory reseting the preferences on LrC.

Certain things are not responsive. The most recent example is exporting. I selected 10 photos to export and hit the export button. It took over a minute for the export dialog to come up. I selected the options I needed (nothing exotic and nothing that has not worked quickly before) and it has been several minutes already and there is no sign of the export happening. Another example is marking a photo as rejected. I hit the X and it says the photo is rejected but it is not marked with an X nor grayed out in the grid view until minutes later.

I observe that LrC is often running at around 100% in the background regardless of whether I am doing anything or not. I left it overnight and it was still doing 102% CPU usage in the morning. I have paused sync, AI culling, Face recognition, and address lookup, so I have no idea what it is doing in the background.

THis is virtually unusable

Thanks