PM, I also experienced a good deal of slowdown in my PS2 version. In fact, I compared the loading times for the PS2 version to the 3DS one, and the PS2 lost by 2x or 3x every time. As an example, when Anise jumps on Guy's back early in the game it took the PS2 version around ten to fifteen seconds for Guy to react. In the 3DS version it was five. Maybe you were lucky or something? Reports of the PS2 verison's technical problems far outnumber the opinions that there was nothing wrong with it. Of course, the doesn't mean the 3DS one is perfect. The graphics seem to have taken a hit, which is really puzzling considering the 3DS has specs that far outstrip the PS2.
Also, about redoing the skits: that would've cost too much money. First of all, they'd have to call back all the original actors (or get new ones to revoice EVERYTHING), and pay them to do all the skits, which is problematic since this game is supposed to generate profit for (hopefully) other Tales games. In any case, unless you want to run the undub patch for the PS2 version (and I don't see why you would since the English voices are excellent), the 3DS version is superior in most ways. Plus it's on the go!