Big Jerk or Lag when starting the game in Iphone caused by Shader.CreateGPUProgram, BatchRenderer.Flush and MeshSkinning.Render

Hi, I need help with Big jerky or lag when starting the game in device (iPhone 7). This Jerk seems to be caused by Shader.CreateGPUProgram, BatchRenderer.Flush, and MeshSkinning.Render.

I'm using Unity 5.6.2f1

I have attached some screenshots and tried few of the following things: 1. Preload Shader 2. Enable GPU Skinning 3. Enable Graphics Job (Experimental) 4. Optimise Game Object The Fbx in Animation Rig Tab

None of the above seems to correct the issue. More Screenshots here: https://www.dropbox.com/s/786fx1a2e7r55rp/Screenshot%202017-11-19%2000.10.28.png?dl=0 https://www.dropbox.com/s/aeesk8f6c9rld2m/Screenshot%202017-11-18%2023.37.23.png?dl=0