The slow down is not that terrible

It mostly comes from the special sword abilities from Holy/Dark Knights as well as high level magic/summons, the rest plays beautifully and actually having a script that not only doesn't insult your intelligence but also raises the expectations of what the player needs to bring to the game is more rewarding than having to deal with a two second delay from a few overly embellished attacks in the game. Its not like the PS1 port of Chrono Trigger.

Not to mention all the extra crap thrown in is both incredibly rewarding and fleshes the game out even more (extra story missions, playing as Delita, a new side quest resolving Beowulf's storyline).