Swift Sneak is an Enchantment in Minecraft that grants the player extra speed while moving when crouched. Typically, adventurers will move at 30% of their walking speed while sneaking. However, with this Enchantment, the user will be able to move 15% faster, meaning they can sneak at 45% of their default walking speed. Swift Sneak has a II and III variant that significantly increases one's crouching speed in Minecraft to 60% and 70%, respectively.
Minecraft fans can utilize the Swift Sneak Enchantment in various ways. For instance, builders will be able to place blocks much faster when constructing bridges or high elevated platforms while crouched over for safety. Their movement speed will be boosted, and they still have the security fall prevention via sneaking. Another useful way to use Swift Sneak is when facing or avoiding the dangerous Warden. Wardens are blind yet aggressive creatures and will charge at players making noise while moving about. However, with this Enchantment, survivors will be able to quickly slip past a Warden while sneaking, thanks to the movement speed buff.
Related: Minecraft: How To Use Spectator Mode
Keep in mind that Swift Sneak only can be applied to Leggings in Minecraft. In the past Beta versions, this Enchantment was used on Boots but was changed in a recent update in Minecraft. Therefore, players must be sure not to place Swift Sneak on their Armor or Helmet since the Enchantment will then be rendered useless. To imbue a pair of Leggings with Swift Sneak, players will need to use an Anvil workstation.
The Swift Sneak Enchantment only spawns in the world as an Enchanted Book. This Enchanted Book can only be found in Ancient Cities, Sculk-filled structures located within the Deep Dark
Read more on screenrant.com