Meant to answer this earlier. I didnít do diagnostics, but it was slowish from the start. When I had El Capitan it wasnít that big a deal, but I noticed from the last El Capitan through Mojave, that opening things like Word got slower and slower. As said, I timed it to 45-60 seconds of icon bouncing before it would open. Heaven help me if I mistakenly clicked something else to open at the same time.
P.S. - that slowness is one of the reasons I tend to use Mac native apps; they worked faster. I mean, once open, Office apps were snappy enough, but wait for them to open was a chore (and they sometimes failed to open, Iíd get fed up and Force Quit the app, then start the process all over again).