Haste: In Depth by Kirschy

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I started out by assuming Haste works in terms of x/256. I was quick to find out the math doesn't pan out on certian calculations. I changed my system to assume Haste works in terms of x/512, and had about 6hrs of data/calculations where the math all works out.

The rest of this post assumes x/512 is the correct way to represent haste values.


All Haste equipment follows a particular pattern:

  • 1% (Blitz Ring) = 5/512
  • 2% (Quick Belt/Dusk Feet) = 10/512
  • 3% (Homam Hands/Feet, Dusk Hands, etc..) = 15/512
  • 4% (Ace's Helm) = 20/512
  • 5% (Turban) = 25/512
  • 6% (Speed Belt) = 30/512

It seems pretti easy to pick up the pattern. All haste equipment can be added together.
Example, using Ace's Helm + Dusk feet... (10/512 + 20/512 = 30/512 = 6%.)


Equipment Haste Cap is 128/512. (25%) [This has been known.]

  • Interesting Note: If you have 25% haste in equipment, your Haste is actualli 125/512. This means you need more than 25% haste in equipment to hit the Equipment Cap.
  • Interesting Note 2: Rune Chopper is 9% Haste, but doesn't check out to be 45/512. In fact it's 47/512. I checked out a variety of equipment, but this is the only piece which seems to have that unique trait.


Haste (Spell) is 75/512. (Roughly 14.65% Haste.) [This has been known.]

  • Magic Haste + Eq Haste adds together. Example: Haste + Turban + Dusk Hands + Dusk Feet. ( 75/512 + 25/512 + 15/512 + 10/512 = 125/512 = 25% Haste )
  • Assuming that a 75 BRD with March + 2 Instrument and capped Wind/Singing skill is capped on March songs. The follow is the haste for each~
  • March 1 = 48/512 (9.375%) [This has been known.]
  • March 2 = 56/512 (10.9375%) [This has been known.]
  • March x2 = 104/512 (20.3125%) [This has been known.]


Both are have numerators that are multiples of 4. I'm hoping I can try some tests later to see how wind/sing skill and instruments affect the marches and where the cap is.

  • The haste cap from Magic/Songs is 224/512. (43.75%) [Known]
  • Recast on spells is capped at 256/512 (50%) from Eq + Magic. [Known]


Fast Cast affects spell recast ontop of the recast cap from Eq/Magic.
I'm currently unable to determine a fastcast cap. (I have an idea to test it sometime.)

  • Homam Legs recast from Fast Cast is: 8/512 (1.5625) [Known]
  • Loq Earring recast from Fast Cast is: 5/512 (.977%) [Known]


Spells have a max recast of 255 seconds.

  • With all of this nailed down I went back to my older tests involving Hasso.
  • Plugging in more precise values for haste makes everything work out much nicer. It can be deduced (with a small margin of error), that Hasso is 50/512 attack speed increase.
  • 104/512 (Marches) + 100/512 (20% Eq) + 75/512 (Haste) + 50/512 (Hasso) = 329/512.
  • 999 * (1 - 329/512) = 357.065 Delay

My results showed a 355.3 Delay
Since the above test showed great accuracy (less than 30 milliseconds off), I feel confidant in applying the following rates to Hasso and Desperate Blows.

  • Hasso attack speed increase is 50/512~
  • Desperate Blows attack speed increase is 25/512, and 25/512 for each additional merit~

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