My life is so much better after I removed #emacs #UndoTree. Things that I just wrote off as failing before, and as freezing my process, just WORK now. For example, it turns out that "elfeed update" causes big buffer changes and that undotree was freezing the thread trying to track those changes. Same story with Telega startup. I had really suspected that my HD was failing; it didn't occur to me that I was getting sabotaged by a global buffer-monitoring plugin.