
Originally Posted by
Kirschy
Fastcast's effect on recast timers works /w haste, but it's not cumulative and instead act as two different terms.
New Recast = floor( [1-Fast Cast] * ( [1-Haste] * Recast ) )
(Round to the 10ths place after each step.)
As it shows, Haste is multiplied first to reduce the timer. Then fast cast is multiplied after to reduce the timers further. The notable Fast Cast terms are as follows:
Fast Cast II: 72/1024 (Includes FC I)
Fast Cast III: 102/1024 (Includes FC I + II)
RDM AF1 Hat: 51/1024
RDM AF2 Body: 51/1024
Loq Earring: 10/1024
Assuming you are a 75 RDM /w AF1 Hat, AF2 Body, and Loq earring, the fast cast term on recast would be 214/1024.
Working the math backwards. You'd need about ~377/1024 haste, to reach the 50% cap. 150/1024 from haste spell leaves 227/1024 haste... thats roughly 22% haste in gear/songs.