DOF effect set with negative near transition region causes Massive FPS loss moving into Focal Region

With a Bokeh DOF setup that essentially places the Near Transition Region into a Negative Space (or non-existence) the FPS drops dramatically from out of focus region to in focus region.

In Focal Region:
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Out of Focal Region:
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1. Open a Blank Project with No Starter Content
2. Add an Unbound Post Process Volume to the level
3. In the Depth of Field Settings check true and change the following:

• Method = BokehDOF
• Focal Distance = 0
• Focal Region = 500
• Scale = 1

1. Turn on Stat.FPS
2. Move Camera close to platform in Focal Region

RESULTS: FPS drops massively as you move into the Focal Region going from approx. 35FPS in Out of Focus Region to below 15FPS in Focal Region

EXPECTED: No discernible loss of FPS moving in and out Focal Region