Immediate mode Optimization with Polygons

We are struggling to optimize Shapes performance with immediate mode drawing. In the same script we draw lines, text, rings, triangles, polylines, and filled polygons. 

My understanding of optimizing with Immediate Mode is that we should draw all objects of a single type in sequence, then move to the next type. Even when arranging my script to do so, I seem to run nowhere near as fast as when I just drop the same quantity of component shapes into the scene as game objects and let your system handle the optimization itself. 

The way I have tested performance differences:

1. Run Scene with both game objects SHAPES and Immediate Mode SHAPES script rendering the same thing

2. Turn off all component game objects, check frames

3. Turn off Immediate Mode script, check frames

Doing this yields a huge boost in frames when the Immediate Mode is shut off and almost no boost to frames when component shapes are turned off. Component shapes seem to be super fast, which is awesome! 

In my ImmediateMode script my code flow is: 

override void DrawShapes()

   using (Draw.Command())

      for (0:lines.count)

         Draw.Line()

      for (0:rings.count)

         Draw.Ring()

...etc

Is that the proper way to optimize? There are more calculations that we do inside that Draw.Command, but even when I create the simplest version as a test script I get bad performance compared to just using component shapes on game objects. 

Since you talk so much about Immediate Mode in the docs, I assume I'm doing something wrong lol. Immediate mode drawing is ideal for us because it lets us iterate faster.

Thanks so much :)