A post on Capcom's blog confirms that Devil May Cry 4 does take around 20 minutes to install, but they claim the Future Publishing journalist who claims it loads just as slow as the Xbox 360 version is talking shit. They state that the PS3 version has near Super Nintendo speed load times and we'll be amazed how fast the levels load.

Once installed — once, mind, not every time you play, as I’ve seen “reported” on certain web sites less interested in facts than in OMG histrionics — the PS3 version of the game has near-Super Nintendo speed load times. You’ll be amazed how fast levels load, the virtually instantaneous transition from cut scenes to action and that you’re continuously playing the game, as opposed to staring at loading screens of a door opening every time you move from one room to the next.