Blended textures on mobile - huge FPS drop

Development Rendering
1

https://i.imgsafe.org/ea3d75e.png

Hi,
why this material setup causes 20 FPS drop? With 1 texture it’s no performance hit so it’s only problem with texture blending.

Without this material I have 60 FPS but with this material on 1 mesh I have 40 FPS…

This is a bug or limititation on mobile platforms?

Thanks for your help.