The PS2 port of Tales of Symphonia suffered from horrendous slowdown and load times, although at least they added new content in. It's nothing compared to Tales of the Abyss's load time, though...

FFIV is the only PS1 port where they didn't screw up with the load times or the sound being changed too much, the only loading times were when saving or loading, which is bypassed by using the Memo save during your play session instead of a normal save, and only saving normally at the end of a session.

But FFVI and especially CT suffered the worst of all. I can't even play the PS1 port of CT.