I’ve been using libreoffice on Windows 10 for years. Recently my calc saves have gone from at most a small number of seconds to 15+ minutes. The progress bar moves fine until it reaches about 97% then hangs for 15 minutes – but eventually completes. The CPU utilization is about 18% percent, so it’s not maxing out by any means. One file I update a lot is about 5MB, so not massive. Less than half the RAM is in use. I’m using the latest version of libreoffice: 7.1.4.2.
Any ideas what the problem is or to debug?