Its ffxiv combat really so slow and boring?

[JohnSpawnVFX]

But if you're talking about songs, no, there isn't an option, unless if you consider going without a song for 40 seconds to be an option.

Here it is, see?

You have 6 song orders you can choose from, plus which ones to cut short and which ones to take to term.

Optimal playstyle is a whole different matter.