I would tend to think that there is no limit to the speed of light with nothing to restrict it. But when time is a factor, it becomes a line.

That sounds confusing.

If a photon was going its speed in the universe unhindered, and experienced a "nothingness" it would instantly be at the "other side".

You can't therefore guage its speed.

I think gravity, and time work the same way.

That being... if you take out everything (anything) in between.. the effect is right there.

If there is nothing between the light source and the destination, the distance in null.