For you who just started to work with VR here are some important things that you should know. Optimisation of your content/scene is key to deliver nice and fast VR experiences. There are lots more resources but this will get you started. Will create a sticky post where we can share important resources
When you are working with Unity:
When working with Unreal:
Actually all the above applies to everything even though. Principle is the same and I will summarize the important ones in another post.