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A video showing the dramatic performance difference between Vulkan and OpenGL on an Android TV device:

Can anyone explain (or at least provide a glimpse to) why the difference is so huge?

It's described in the link: http://blog.imgtec.com/powervr/gnomes-per-second-in-vulkan-a..., the code doesn't use any batching but each gnome is a unique draw call, which is a worst-case scenario for OpenGLES2.