What is fast? Movement of something through the space-time fabric in which time and space are relative to another something. The larger the space; the more time is warped. The faster the time cycle (vibration) and the space becomes warped. Is time a cycle or collection of pulses?
How fast can something go? Speed of light? How about thoughts? Do they travel? How fast is the speed of thought? Much faster than the speed of light but something else happens. What happens when you approach the speed of thought? What does that construct feel like? Space changes from a 3 dimensional shape to a folded multi-dimensional construct in which a point in space is here – now. Time becomes … an illusion. Space shifts into something else beyond our comprehension into a pace where you create.
You may dream at the speed of thought in which you are able to travel throughout the Universe or Inter-verse as fast as you are aware of it … or as fast as you create it. So perhaps the speed of thought can be (1) the velocity at which we create and (2) the velocity at which awareness travels through a construct.