Every time I start Rocksmith 2014, I have to sit through about 15 seconds' worth of intro screens. Is there a way to skip all of that and get straight into the game?
The Intro screen is there for a reason, the game is still in the process of loading:
The game is actually still loading while the splash screens appear, so they're not actually increasing load -> play time, just giving you something different to look at while you wait for it to load.
Meaning the 15 Second wait is not removable and is compulsory to the game.
BUT Even if you did follow lh8registration method you would still have to wait that "15 Second" time for the game to load. (I do not know if this method works)
Don't have this game myself but you can try and locate the actual file that contains the intro movie and replace it with an empty file. I find this trick works for most games, usually the file is called intro.bik or something similar. Good Luck!