I switched from using Excel because it kept having a fatal error when I tried to save my files. Libre Office Calc doesn’t have that problem but it’s terribly slow whenever I want to switch to it from another application. It says “Not Responding” for up to five minutes or so. In the meantime I’ve often opened Excel instead, done what I needed to do, and closed it again.
What’s causing this and is there anything I can do about it?