"So now that we've ascertained that light is not fast but rather is excruciatingly slow, we can now turn to a more pressing and difficult matter: Why?" For me

"So now that we've ascertained that light is not fast but rather is excruciatingly slow, we can now turn to a more pressing and difficult matter: Why?" For me it is not that light is slow, but rather the universe is large.. large space time.. most of it taken up by space.