Fast Mine
Fast Mine allows you to mine blocks faster than vanilla.
Specifies the multiplier for the block mining speed.
Break delay
Section titled “Break delay”Vanilla Minecraft waits 250ms after breaking a block before you are able to start mining again. This setting allows you to reduce that delay.
Always decrease break delay
Section titled “Always decrease break delay”In vanilla Minecraft, the delay after breaking a block only ‘counts down’ while trying to break the next block. This means that if you break a block, immediately stop mining and then try to mine a block several minutes later, the game would still apply the delay before breaking the second block.
With this setting enabled, the delay will always count down each tick, regardless of whether you are trying to mine
another block. Note that this has no affect if you already set your Break delay to 0.