Have you noticed when dragging dimensions for circles and arcs so they are positioned just right they seem to jump around and are fidgety. Try this and the movement will be much smoother. Go to File/preferences/snaps and in category dialog box set alignment angles to 0,0 and then hit apply. The default is 45 degrees and the leaders want to snap to that angle and we don't want that for smooth dimensioning.

Next when moving dimensioned 2D or 3D objects always window select from the upper left to lower right and everything will move together. If we select from lower right to upper left the dimensions vertexs don't want to move with the parts.

Hope someone finds this helpful.
Chuck