With Archicad 21 Update 5021 release, having Favorites Palette open in a project will result in performance degradation affecting the responsiveness of Archicad . Lag varies on the operation command executed and some operations seem to be heavily affected by this issue. For instance, placing a wall or moving an object with the Favorite Palette open will cause a slight lag in the operation, while entering custom text in a dimension will trigger a considerate delay during text input.
If this performance drop is frequently affecting your work speed, close the Favorite Palette when is not needed. A permanent fix is scheduled for an upcoming update.