So, really fast, but not what we would consider relativistic.

That's may be in the range of speed that is most unfamiliar to us. We get speeds up to orbital velocities, in the 10 km/s range, as these are the "fast" objects we know (rockets, meteorites, ...), and then we get to significant fractions of light speed, mostly in the context of communication. But what goes at 900 km/s in our day to day life? Is it a number we see anywhere besides colliding galaxies?

c is just crazy fast. But still slow compared to the size of the universe!