In a simple sceene with one unity plane, one camera and one pixel light with hard shadows I get 4 draw calls for plane. Why???,
Is it a directional light or another type of light? I’m guessing you’re also using forward rendering. Forward rendering in Unity has a draw call for ambient light, emissive light, spherical harmonics and vertex lights. Then an additional pass is made for each pixel directional light. Point lights and spot lights always take an additional pass each if they are pixel lights. I believe additional passes are also made for each light if there are shadows on.