I have read a lot about users struggling with ArcGIS Pro being very, very slow. For two years I have been hoping this is just temporarily. Even on small datasets stored locally, a simple command like "merge" (polygons), "clear" (selection) or "save "edits" may take 2 or 3 minutes. And the program freezes between these commands. ArcGIS Pro is really a drag and something I really avoid when I can. I usually have a an ArcMap mxd-document "on the side" to perform certain tasks because ArcGIS Pro treats even the simplest task as something heavy and complicated. Merging two polygons takes half a second in ArcMap, but ages and ages i ArcGIS Pro. The developers have really done a lousy job here, and the software should have been tested and improved before rolled out.