When running the program myuy computer becomes extremly slow. Internet speed drops from 900MPS to 35MPS on downloads. Can’t run other programs at the same time or I get the ‘spinning ball of disaster’.
I guess you are on a Mac but I shouldn’t have to guess, see This is the guide - How to use the Ask site? - #3 by Hrbrgr
This applies to only Mac computer, click LibreOffice > Preferences > LibreOffice > View and uncheck Force Skia software rendering. OK and allow LibreOffice to restart. See this question, Libre Office still super slow in latest Mac OS