[Low fps in 3D game]

Hello. I'm building a 3D game using WaveVR SDK in Unity. It's a mini town with buildings and moving cars.

However, my game is always with very low fps  which is around 6 ~ 15 fps.

I would like to ask usually what factors will cause a low fps?

Thanks a lot!

[Camera leaving his body in first-person game]

Hello. I'm using Vive Focus Plus and building a game with wave unity SDK.

I have a game where the player will just sit on a bed throughout the entire game, I simply place the camera at the "head" position. The problem is when I lead forward/backward my camera will leave the gameobject and "see himself" staying at the original position. What will be a better approach to avoid this weird situation?

I'm thinking should I black out the player's view when crossing a threshold, so as to limit camera rotation? 

Hope I have made myself clear. Thanks a lot! @JustinVive @Tony PH Lin @Corvus

[No shadow in VIVE Focus Plus]

Both quality level are set to High, I use realtime lighting in my test scene with only a few gameobjects, and my graphics api is OpenGLES3. @Tony PH Lin @Sean Lu

[No shadow in VIVE Focus Plus]

@Corvus I tried to set Quality level as High/Very High/Ultra High and shadow distance as 50 and 100 respectively, but no cases show the shadow. Anything else I should be aware of? Thank you!

[No shadow in VIVE Focus Plus]

Hi , I'm trying to build VR game from unity to Vive Focus Plus.
When build and run on the device, the shadow disappears. They can be shown in editor. It's a simple scene with a couple of objects.

Does anyone can help ?

Many thanks,
Christy