For all my AutoCAD files (no matter how big or how small) it seems like for every new action I do, a zoom out, change of tool, going to the menu,... etc that my Macbook freezes for a few seconds. Super annoying. I wonder what could be wrong. The bigger the file the more seconds I have to wait before I can continue working.

Any ideas?

Never had this bore but since a few weeks I have this.
I have Mojave 10.14.6. 499GB, 117GB free space

AutoCAD 2020 LT for MAC  => updates are up to date
Files usually have a few blocks, some a data link or Xref, some are not big at all.