Attack Speed in Terraria is handled like movement speed; Additive bonuses, except the cap, are at four times the original speed. However use time, or the time it takes to swing (attack) or use an item, is reduced instead of increased (see that page for a more detailed formula). In addition, for melee weapon with a projectile, the Attack Speed also increase the Velocity of that projectile by that many percent. Use time of 30 is slower than use time of 10. See weapon list for an organized view of this.
Max increased attack speed (for melee) is +158.1% using Monk's Bushy Brow Bald Cap (20%), Shinobi Infiltrator's Torso (20%), Solar Flare Leggings (15%), Exquisitely Stuffed (buff) (10%), Tipsy (buff) (10%), and the five accessories Feral Claws (12%), Power Glove (12%), Mechanical Glove (12%), Celestial Shell (15.1% at night) and Berserker's Glove (12%), each reforged to Violent (20%). In Expert Mode Violent Fire Gauntlet can be worn for an extra 14%, with +172.1% total; In Master Mode an additional Violent accessory (note, as of 1.4, the stones' effect no long stacks) can be worn for an extra 4%, with +176.1% total. When combined with the fastest melee weapon, the Fetid Baghnakhs, a player may execute a full melee attack in roughly 0.033 seconds, or thirty times per second (note:as of 1.4, it can only receive up to +25% speed bonus).
- 穿着稽古衣能獲得 10% 攻擊速度提升。
- 暗影盔甲套裝中的每一件都能帶來 7% 提升，穿齊全套提升 21%。
- 鈷頭盔能帶來 12% 攻擊速度提升，穿齊鈷套裝則有 27%（頭盔 12% + 套裝獎勵 15%）。
- 鈀金面具帶來 12% 攻擊速度提升。
- 山銅面具帶來 7% 攻擊速度提升。
- 帶有精金頭盔的精金套裝能帶來 18% 攻擊速度提升。
- 神聖面具帶來 10% 攻擊速度提升，神聖套裝的套裝獎勵還能額外提供 19%。
- 帶有甲蟲盔甲的甲蟲鎧甲套裝所帶的增益在充分蓄力後能提供高達 30% 的額外攻擊速度提升。
- 和尚濃眉禿頭帽和滲透忍者上衣帶來 20% 攻擊速度提升。
- 耀斑護腿帶來 15% 攻擊速度提升。
Note: Even though you have an incredible attack speed you must take the monster's invincibility time into consideration. Generally speaking, no invincibility time is applied when referring to projectiles that do not pierce, but those that do pierce or explode are not in this case. Normally it is 1/6 seconds (10 ticks) while there are some exceptions ranging from 5 ticks to 20 ticks.