Thanks for your reply.
This is just a test scene, has nothing to do with what I wanna achive. I create custom meshes at runtime, each shall be editable after creation. That makes merging nearly impossible and instanced meshes are not possible either.
That test was run in standalone, as mentioned.
I am also developing for VR, HTC Vive. For that I need const 90FPS. 120FPS in the testscene was just for testing.
Just wondering why the hardware seems not to do stuff when there is lot to do, to reach the min. desired FPS.
Edit: Would be happy to reach half of that 5000 Draw calls. Performance already drops when reaching 500 in the project.