That's because the model heavily relies on subdivision level to smooth out the model, what you can do is simply tick the "Simplify" option under the Render tab for performance boost while posing and tick it back off when render.

You can disable Depth of Field or DOF by selecting the camera, and looking under Camera Settings for the option to disable Depth of Field.

Luckily I have simplified the shader into an easy slider for easy control, you can find that option in the Shading Tab and just set "Stylized" to 0 to disable it entirely.