Develop mode slows to a crawl on a particular photo, CPU usage skyrockets.
When I try to edit a particular photo (but not other photos) using the Develop mode in LRCC v12.1 (the most current version as of now) my computer grinds away, but is unable to accomplish any edit function except glacially with occasional blips of apparent activity. Meanwhile CPU usage soars for the app. If I switch to Library mode, CPU usage reverts to normal and LR again becomes responsive (but of course I can't edit the photo in that mode). Allowing the app to run in Develop mode overnight (as if it might need some time to clear out background tasks) does not improve the situation. If I try to re-crop the photo, for example, it could take ~5 minutes for LR to move an edge slightly.
I reverted to the previous version LRCC v12.01, and can once again edit the same photo normally. I'm using a PC on Win10.
If someone at Adobe wants to test for this behavior using my photo file, let me know and I'll upload it for you.
