Video producer here:
I normally don’t work with blu-rays (for various reason that wouldn’t really add to the question.)
But when you burn a DVD it usually burns somewhere between 7mbps - 9 mbps depending if its a type 5 or 9.
Blu-ray is considerably more than that, i believe normal data transfer is somewhere between 30mbs and 50mbps.
So you have about 4-5 times the amount of information being thrown out than on a regular DVD.