Clarification on DET

[StouterTaru]

Spell Speed is not. It's pretty much *the* stat to max out on BLM because BLM effectively has unlimited MP, and their damage output is directly tied to how fast they can burn their MP and swap between Astral Fire & Umbral Ice.

Spell speed doesn't take you past the GCD, and most of the spells you cast will be at or under the GCD without any spell speed.

Normal rotation for single target:
Blizz3 - 3.5
Thunder
Fire3 - 3.5, but cut in half from UI3
Fire spam
repeat with Bilzz3 - still 3.5, but cut in half from being under AF3
Fire3/Thunder3 tossed in when you get an instant/free

So 1 spell at the start benefits from spell speed.


Normal AoE rotation:
Fire3 - 3.5
Fire2 spam
Swiftcast Flare
Convert
Fire2
Flare - 4.0
Transpose
Blizz3 or 2xBlizz2

Some benefit in there, but nothing that is huge. 10% off your cast time might get you 2-3% off your cycle time.

[Azoryl]

Spell speed doesn't take you past the GCD, and most of the spells you cast will be at or under the GCD without any spell speed.

Spell Speed (and Skill Speed for that matter) does lower the GCD. As a BLM, I am at a 2.3 GCD. Not only do my spells cast faster, but the recast time is shorter. At my current spell speed, all my spells have a 8% speed increase. That is pretty big.

The reason Skill Speed is not as good is TP is a limited pool. So increasing the speed of attacks just depletes the pool faster. BLM have unlimited mana, which is why spell spd is so important to them.