I’m working on a fairly basic file, all 2d sketches in SketchUp and brought into LO for dimensions notes etc…however recently I have noticed Layout seems to stall (not responding) when I copy and paste text between notes…
One idea I have is that it can take a while to recreate the thumbnail in the Pages panel, especially if there are demanding viewports on the page. Your innocent copy and paste could still lead to a long delay while the whole page is rendered to make the thumbnail again.
Do you get the same delay if the Pages tray is not open?