There is a lot of work going on in VL especially for the first import - adding levels, searching for and adding structural families on the fly, writing elements (beams and columns), creating plans and annotating plans. All of that writing to the Revit file takes time.

Annotating plans seems to be the most intensive for the initial creation. You end up writing three tags +/- for each beam - three times the work. However, subsequent updates for all of the elements take a fraction of the time - checking and updating is much quicker than adding and writing to the disk.

To help with this in the early phases of a project where concepts are changing frequently, a toggle button option was added to the settings dialog to turn on/off the annotation of members. For a large project, this can save a significant amount of time in teh early phases of design. Once the framing has settled down or the plans need to be sent out, simply rerun VL with the annotation feature checked, and let it grind through the annotations once. It will tell you no members changed but will proceed to tags all of the framing.

Yes, the Revit version of beam annotation generation appears to be quicker, but Revit doesn't have the filter for a min reaction. VL does!