Question: why is ffxiv so slow?
Answer: It is slow early on because the GCD is 2.5 seconds. The more you level, and the more skills you get, the faster it'll pick up. At end game you'll be weaving oGCD skills in between the GCD, so it certainly does get faster. Depending on the class, it probably won't change much until lv50, and even more so at end game.