- Casting Time Bonus (Fast as +1, Fastest as +2) Actual -Casting Time Bonus (%)

+1 +8%
+2 +18%
+3 +30%
+4 +30%
+5 +44%
+6 +63%
+7 +63%
+8 +86%
+9 +86%

可以清楚的看到(+1,+2), (+3,+4).... 為一組 因此有時候Fast and Fastest的功效是一樣的 理論尚可到達+8吧