It's really annoying.

1) Titan fight(obvi): I watch the cast bar and half a second later the plumes pop, but two pop then the third one pops after, then they all explode at the same time. lol
2) Non GCD abilities: You have to spam like 8 times after a GCD goes off or they won't fire(like halfway through the GCD cool down they'll fire). Not only this but if you use a nonGCD ability then you block your self for .5-1s after it for using a GCD. Makes zero sense, feels very unnatural and makes game play annoying and frustrating.

Swiftcast > Fire III has a cast time. Swiftcast > wait 2s > fire III is instant.
Umbral ice III > Fire III > Fire I: Fire I has umbral cast time.