Diminished Returns - NBumgardner/mcMMO GitHub Wiki

mcMMO has a feature where XP gains are reduced when a player reaches a certain (configurable) threshold value of total XP earned in a specific skill within a certain time limit. By default this feature is disabled and it can be enabled from the experience config file; experience.yml

Depending on how far the player has exceeded the threshold value, his XP will decrease more. The registered data will be cleared in a "rolling fashion", so when the XP gain speed is no longer exceeding the threshold the player will gradually gain more XP again - all automatically.

 Diminished_Returns:
    Enabled: false

    # Limit the amount of experience a player can earn:
    # Threshold (amount of experience) per Time_Interval (in minutes)
    Threshold:
        Swords: 20000
        Taming: 20000
        Acrobatics: 20000
        Excavation: 20000
        Herbalism: 20000
        Unarmed: 20000
        Woodcutting: 20000
        Mining: 20000
        Archery: 20000
        Axes: 20000
        Repair: 20000
        Fishing: 20000
        Alchemy: 20000

    Time_Interval: 10