Table with Casting Time reduction from Dexterity
 
 

Setup

My setup (= subpar):
 

• L44 Vagabond Class (DEX 13>14)
• MND 99 plus DEX 14-99 (25.000.000 Runes farmed)
• Finger Seal +0
• Cerulean Amber Medallion +0 Talisman (+7% max FP)
• 450>481 max FP
• Incantation Scarab Helmet (-15% Incantation FP Cost)
• 80x spellcast of: Cure Poison (7>6 FP)
• Mouse Macro: Auto-Leftclick
• time stopped the moment FP bar is fully depleted

 
Optimal setup:
 

• Hero Class (DEX 9)
• MND 99 plus DEX 9-99 (30.000.000 Runes farmed or Respec)
• Finger Seal +0
• Cerulean Amber Medallion +2 Talisman (+11% max FP)
• 450>499 max FP
• Incantation Scarab Helmet (-15% Incantation FP Cost)
• Primal Glintstone Blade Talisman (-25% Incantation FP Cost)
• 99x spellcast of: Cure Poison (7>5 FP)
• Mouse Macro: Auto-Leftclick
• time stopped the moment FP bar is fully depleted

DEX and Casting Time

Cure Poison has a very low FP cost while having a fairly long Casting Time of around 3s at low DEX. It is the only spell that can lead to verifyable numbers on reduction of Casting Time when having extremely low time differences in mind.
 
 
*Note: Numbers for DEX 9-13 were estimated by me. Ive assumed and set a DEX of 9 as Casting Time 100%. I cannot verify this since I didnt start with the Hero Class, the only Class that can fully unearth the hidden numbers of Casting Time.
 
 

Conclusion / Findings

1. Casting Time reduction from DEX caps at DEX 70 and the reduction is stretched evenly between each point. DEX 71-99 does not change Casting Time at all.
 
 
2. At DEX 70, Casting Time is around 90% of the initial value, meaning a 10% reduction. A spell like Cure Poison that takes around 3,0s to cast, now takes only 2,7s to cast.
 
 
3. Since the reduction is linear, as with Critical Hit Chance that nears a fixed value like 100% in other games, Casting Time Reduction works opposite than diminishing returns, yielding a slightly better increase the more points you put into DEX, meaning a 1% reduction from 91 to 90% is worth slightly more than a 1% reduction from 100 to 99%.
 
 
1 – ( 99 : 100 ) = 1 – 0,990 = 0,010 (gain)
 
1 – ( 90 : 91 ) = 1 – 0,989 = 0,011 (gain)
 
 
4. Thus, when going for Casting Time, it is best to get DEX exactly to 70 and neither a lower or higher value.
 
 
I hope this was of some use. Wanted to share. Sincerely.
 
 
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