Twice in the past few days, I've been working on "normal" size Excel files, and then realized that everything was becoming very sluggish.
I saved the files, which took a very long time. One file had become 35 MB, and the other one had become 4+ MB. I found one of my tabs where a control-End took me way down deep in the sheet - not to the far lower right, but to cell AI 1048554.
What am I doing wrong? Why would this happen to me twice within a few days?