Adobe InDesign CC 13.1 on Sierra
The copy and paste of graphic blocks in the same doc is very slow. When there is not a large number of links, it is pretty ok BUT when adding a lot of new picture links, the wheel keeps turning during ca. 10/15 seconds after each copy and paste of a graphic block also.

The temporary solution is to change the name of the image folder so to disable the dynamic links to pictures. But not ideal.