MTV's Multiplayer blog investigated further into this, citing that it all comes back to developers getting to know the Blu-ray technology and utilizing its unique characteristics. For multi-platform games like DMC4, the issue is that developers are not optimizing their titles for Blu-ray tech. There are two factors: the disparity between DVD and Blu-ray reading techniques, and the size of Blu-ray discs compared to DVDs. If developers just simply plop down their DVD data onto a Blu-ray disc, essentially, all that extra space on a Blu-ray and the single speed that the data on it is read will cause excessive load times. Think of it this way, if DVD is looking for a needle in a haystack, then Blu-ray is looking for a needle of exact same size in a haystack three times larger.
c'est intéressant je savais pas, merci joséphine!!