The speed of light has really not kept pace with Moore's Law. Engineers have focused overly much on clock speed and transistor density and completely ignored C, and it's really beginning to show.
The trips themselves of course consist on transmitting the mind to be downloaded on a new body on the other side.
And you're a mind running on a computer! You were already going to experience the heat death! This is just a scheme to get the most subjective time out of it as possible. (Running slower is more efficient.)
Bay Area, 2020s: "Soon we will have rooms the size of a single computer"
OTOH can the heart perform equally good if human get miniaturized?