GPU instance save GPU time.but no FPS

Unity Engine
1

Everyone says GPU instance can release the GPU and improve FPS,I tried that,it does release GPU,but apparently the cpu and FPS has not been improved,unlucky it slows down:
WIndows 7,GeForce GT 620
Unity standard shader,1800 instance of a teapot,vertex:1.8M triangles:1.2M ,one directional light.no shdows(with cascade shadows, without GPU instance is more fast)
Why？
3153413--239724--GPU_instance.png with GPU instance
//
3153413--239725--noGPU_instacne.png without GPU instance

2

Well, that is in editor. I would try a standalone build without VSync.

Edit: It doesn’t really release the GPU by the way. The GPU still renders exactly the same thing. But the CPU is actually released, because there are less commands to send to the GPU.

3

I would also profile which is a more reliable indicator than a glance stats window…

4

These teapot share the same material without variable,I think miracle will happens if these tea-pot has differrent props such as color,with GUP instance-They still share the same material not 1800 mateials-because of color