Geoprocessing is relatively slow in ArcGIS Pro. For example, creating a linear referencing Route Event Layer was instantaneous in ArcMap using the UI dialog (raw ArcObjects/C++?), but the Make Route Event Layer geoprocessing tool takes 10 seconds to run in both ArcMap and ArcGIS Pro 3.2.2. Other UI-like geoprocessing tools are relatively slow too. Same with analytical and data management geoprocessing tools.
It's my limited understanding that a lot of geoprocessing tools are Python under the covers. Python is notoriously slow compared to most other programming languages.
Modular's Mojo language is an up-and-coming superset of Python. It honours Python syntax but is orders of magnitude faster than Python.
When Mojo eventually becomes stable/when the kinks are worked out, could Esri consider replacing Python in ArcGIS Pro with Mojo?