If we run RenderPerfTest with 15000 3DSphere objects we are seeing lesser FPS compared to other 3D primitives like 3DBox or 3DCylinder

Metal(15000 objects):
3D Box : 11.377 FPS
3D Cylinder : 10.075 FPS
3D Sphere : 6.309 FPS

OpenGL(15000 objects):
3D Box : 19.09 FPS
3D Cylinder : 18.953 FPS
3D Sphere : 18.75 FPS

Metal numbers are overall lesser than OpenGL numbers but in case of Sphere difference is more.