Quote Originally Posted by Arkenne View Post
A little fun detail about RDM is that it is surprisingly more lag-unfriendly than even NIN.

RDM's dualcast is ultimately a buff that applies after your cast from an answer from the server. If your button press beats this answer you will start hardcasting your second spell instead of insta-shooting it.

BLM on the other hand is much less affected by lag on its core gameplay. At most you'll be unable to slide-cast at the 80% cast bar completion.

Ultimately its just a factor that matters only if you tend to be lagging.
Ive never accidentally hard-casted a spell that should have been instant playing from Australia with a ping in the mid-100s (around 150-170). I haven't played rdm a lot but that's after probably 40-50 minutes on a dummy.

I'm not sure what sort of ping you'd need for that to become a problem; I'm sure it happens, but if it does it's not a ping I'd enjoy playing FFXIV at.