Optimize draw call UI

I have 2 mesh with same texture but get called twice draw call.
Can anyone explain it to me? I am using sprite atlas for my UI.
Size of atlas is 1024x2048

 

Are any of these things actually causing you performance issues? How many draw calls are you actually hitting?

 

Ah, I'm wondering why it needs 2 draws for the same texture

 

Are they sorted the same and on the same Z level?

 

Yes. It belongs to the same panel

 

Them being on the same panel doesn't imply either of those things. Again, I have to ask:

 

Is your mesh within a scroll rect? or some sort of masked layer?

If your ui component is nested within an object with a mask component, then the draw calls usually will double.
I have not pursued a performance improvement for this.