In supercruise I rationalized it as ALL computer rendered view..
Because travelling routinely at 15c would otherwise be a rather boring view:
[well, darn I was going to put a kewl photo here, but Google failed me. So, Imagine:]
[Tunnel of distorted light, blinding white region in front of you, blueshifted and compressed images of outside to your front in all directions, Redshifted and stretched view slightly rearward of beside you, and utter blackness behind]
As you cannot in fact use light to see anymore when you are moving faster than it does, then obviously supercruise "views" are graphically rendered to show how the system would appear. [they should but the docking menu swipe animation upon start of supercruise]
At normal flight, the bits can be attributed to stellar winds interacting with the shields.
In hyperjump, those stars you are zooming past are "hyperspace stars", among "hyperspace dust clouds" in a nascent "hyperspace universe" that you are passing through as a shortcut.