Castle Clash Attack Speed Acceleration, by Henry J. Cobb

Explanation

Castle Clash apparently rounds the time it takes to make an attack up to a fifth of a second after applying acceleration modifiers. Both Berserk and Pumpkin Duke have the same effect at the same level, so I'm just listing an acceleration level, which would be either the Berserk level or the Pumpkin Duke skill level. When these stack on top of each other the result is better than adding the two levels together and adding one. How much better is complicated.

Deadly fast

Grizzly_Reaper

Raw attack speed: 0.75 seconds

• No acceleration: 0.8 seconds
• Acceleration 4: 0.6 seconds

Very fast

Ninja (Or Normal speed + Berserk-4)

Raw attack speed: 0.8 seconds

• No acceleration: 0.8 seconds
• Acceleration 6: 0.6 seconds

Fast

Assassin

Raw attack speed: 0.9 seconds

• No acceleration: 1 seconds
• Acceleration 2: 0.8 seconds
• Acceleration 9: 0.6 seconds

Normal

Melee troops, Alchemist, Angel, Aries, Champion, Cyclops, Druid, Engineer, Executioner, Frost_Witch, Hill_Giant, Ice_Demon, Immortep, Marksman, Pumpkin_Duke, Serpent_Queen, Snowzilla, Spirit_Mage, Succubus, Thunder_God

Raw attack speed: 1 seconds

• No acceleration: 1 seconds
• Acceleration 4: 0.8 seconds

Sluggish

Cupid, Death Knight, Moltanica, Orksbane, Santa_Boom, Siren, Vlad_Dracula

Raw attack speed: 1.2 seconds

• No acceleration: 1.2 seconds
• Acceleration 3: 1 seconds
• Acceleration 9: 0.8 seconds

Slow

Ranged and Magic attack troops, Destroyer, Dryad, Marauder, Minotaur_Chieftain, Pain-Da, Paladin, Pixie, Shaman, Triton, Werewolf

Raw attack speed: 1.5 seconds

• No acceleration: 1.6 seconds
• Acceleration 1: 1.4 seconds
• Acceleration 4: 1.2 seconds
• Acceleration 9: 1 seconds

Glacial

Destructive attack troops, Atlanticore

Raw attack speed: 2 seconds

• No acceleration: 2 seconds
• Acceleration 2: 1.8 seconds
• Acceleration 4: 1.6 seconds
• Acceleration 8: 1.4 seconds