Usually, painting with 4k mode enabled seems to be a resource hog and often laggy (even with an 2080ti)
Today was different, I was getting great performance, I baked in 8k and was painting away without a care in the world. Made note to save my project multiple times as I was going along.
Restarted my computer because of a stupid razer mouse issue, come to load up my project and low and behold, my save file is about 50 saves old and all that work is gone!