LagFixer

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LagFixer is the ultimate performance boosting Minecraft plugin designed to optimize your server and eliminate unnecessary lag. By fine-tuning various server aspects and streamlining redundant features, LagFixer ensures a smoother and more enjoyable gameplay experience for all players.

Requirements:

Java 8 or later
Server version 1.13 - 1.21.3

Supported versions:

1.16.5, 1.17.1, 1.18.2, 1.19.4, 1.20-1.21.3
Most modules run on a wider range of versions [1.16.5 - 1.21.3]
Forge based spigot forks: Mohist, Arclight etc.

Folia support (HELP)

We have removed support for servers running on Folia-based forks. Support for Folia was highly problematic and significantly limited the capabilities of the LagFixer plugin, especially in terms of increasing the asynchronicity of its methods. Since the engine itself is designed to be asynchronous, LagFixer cannot operate without impacting gameplay by executing on other threads.

Supported plugins

Placeholders

%lagfixer_tps% - Current ticks per second
%lagfixer_mspt% - Current miliseconds per tick
%lagfixer_cpuprocess% - Current process cpu usage
%lagfixer_cpusystem% - Current system cpu usage
%lagfixer_worldcleaner% - Countdown to world clean

Commands

/lagfixer - main plugin command
/abyss - the place where deleted items go

Config

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#some of the options below require a server restart or plugins reload
main:
  prefix: "&8[&e&l⚡&8] "
  prefix_hover: true #LagFixer version info hover
  threads: 1 #LagFixer does not have multithreading yet
  monitor_interval: 5 #update interval in seconds for tps, mspt, cpu and others
  errors_reporter: true #automatic reporting errors caused by LagFixer and Spark profiler to our support
  updater: true
  warnings: true #warning for legacy methods without support
  command:
    permission: "lagfixer.command"
    aliases:
      - lf
      - antilag
      - lag

modules:
  CustomAi: #restart is needed to load all changes
    enabled: true
    worlds:
      - world
      - world_the_end
      - world_nether
    values:
      collides: true #bow arrow don't work when this option is false
      silent: true #disables the transmission of audio packets, which can increase server speed for large farms
      async: true
      force_load: false #this option is responsible for overwriting entityai when the plugin is reloaded
      click_event: true #send information when the player clicks on the creature (disabled by dev)

      #which entities should have replaced mobai and pathfinder system
      entities:
        animals: true
        monsters: true
        villagers: true
        tameable: false #pets, for example: wolf, horse, cat, llama, parror etc. (true - may cause some issues)
        birds: false #flying entities, for example: bees, parrots
        others: true

      pathfinder:
        #keep mobchip pathfinders wrapper, only for 1.17+ servers (not tested)
        mobchip: false

        #keep only dedicated pathfinders for mob, for example
        typeA:
          enabled: true
          whitelist: #don't modify it if you aren't a developer
            - AttackableTarget
            - HurtByTarget
            - Attack
            - BowShoot
            - Swell
            - EatTile
            - FishSchool
          # - AvoidTarget
          # - RestrictSun
          # - FleeSun

        #removing useless random moves that load the server
        typeB:
          enabled: false
          blacklist: #don't modify it if you aren't a developer
            - Random
            - LookAt
            - Panic
            - AvoidTarget
            - MoveTowards
          # - Float
          # - FollowParent
          # - MoveThroughVillage

        #clear all existing pathfinders (not recommended)
        typeC:
          enabled: false

      animals:
        tempt:
          enabled: true
          range: 5.0 #player search range
          speed: 1.25 #speed of walking
          cooldown: 30 #player search cooldown in ticks
          villagers: true #villagers will follow players with emerald in hand
          trigger_both_hands: true #false = only main hand
          event: false #call EntityTargetEvent with Reason: Tempt
          teleport: false #not recommended
        breed:
          enabled: true
          range: 5.0 #partner search range
          speed: 1.0 #speed of walking
          event: false #call EntityTargetEvent with Reason: Custom
          teleport: false #not recommended
        panic:
          enabled: true
          rangeFromPlayer: 7 #required distance from the attacker to activate
          speed: 1.95
          cooldown: 15

  CustomVehicles:
    enabled: true
    worlds:
      - world
      - world_the_end
      - world_nether
    values:
      minecart:
        enabled: true
        remove_chest: false #removes minecarts generated by minecraft world, should help for servers where new chunks are generating
        silent: true #disables the transmission of audio packets, which can increase server speed for large farms
        max_speed: 8 #default maxspeed in minecraft is 8
        physics: true #when value is "false" vehicle can fall out of the world if it is on a block other than rail, maybe this will be fixed in the future
        culling: false
        collides: false
      boat:
        enabled: true
        silent: true #disables the transmission of audio packets, which can increase server speed for large farms
        max_speed: 8 #default maxspeed in minecraft is 8
        physics: true #when value is "false" vehicle can fall out of the world if it is on a block other than water, maybe this will be fixed in the future
        culling: false
        collides: false

  LagMonitor:
    enabled: true
    worlds:
      - world
      - world_the_end
      - world_nether
    values:
      needed_mspt: 75 #when the server has mspt above this value, the lagfixer will set the options listed below
      durning_lags:
        simulation_distance: 2 #this value can be only 2-32, set a lower value than that in the fork configuration
        view_distance: 2 #this value can be only 2-32, set a lower value than that in the fork configuration
        disable:
          entity_spawn: true
          tick_hopper: true
          redstone: false
          projectiles: false
          leaves_decay: true
          mobai: false
          liquid_flow: true
          random_tick_speed: true
          view_distance: false
          simulation_distance: true

  ConsoleFilter:
    enabled: false
    values:
      logs_limit: 10 #limit of logger saves in directory "/logs", -1 disables this feature
      filter:
        enabled: false
        save_filtered: true
        error_filtering: false
        patterns:
          - '^<(([A-Za-z0-9_]{3,16}))> (.{0,})' #filter all Chat messages
          - '^/([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\:([0-9]{1,5}) lost connection' #filter all "lost connetion" messages
          - 'Reached end of stream for /([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$' #filter "Reached End of Stream for {ip}" messages
          - '([A-Za-z0-9_]{3,16}) issued server command: /(.{0,})' #filter all "Player issued server command" messages. Useful for example for AuthMe in fact of hidding passwords.
          - 'Read timed out' #filter "Read timed out" messages
          - '^.*logged in with entity id ([0-9]{0,}) at.*$' #filter all login messages
          - '([A-Za-z0-9_]{3,16}) lost connection: Disconnected' #filter player disconnect messages
          - '^(§e)([A-Za-z0-9_]{3,16}) left the game.' #filter messages like "§ePLAYER left the game."
          - 'Connection reset' #filter all "Connection reset" messages
          - 'CONSOLE: Forcing save\.\..*' #filter console force saving messages
          - 'CONSOLE: Save complete\..*' #filter console saving messages

  AntiClock:
    enabled: true
    worlds:
      - world
      - world_the_end
      - world_nether
    values:
      ticks_limit: 1100 #limit of ticks per chunk every second
      break_redstone: false #should plugin break redstone
      lever_cooldown: 700

  EntityLimiter:
    enabled: true
    worlds:
      - world
      - world_the_end
      - world_nether
    values:
      alerts: false
      perchunk:
        enabled: true
        creatures: 15 #animals and monsters per chunk
        items: 25 #dropped items by player per chunk
        vehicles: 3 #minecarts and boats per chunk
        tiles: 10 #disabled by developer
      perworld:
        enabled: true
        monsters: 70
        animals: 10
        water_animals: 5
        water_ambient: 20
        water_underground_creature: 5 #only for servers 1.17+
        axolotls: 5 #only for servers 1.18+
        ambient: 15

  WorldCleaner:
    enabled: true
    worlds:
      - world
      - world_the_end
      - world_nether
    values:
      interval: 240 #in seconds, countdown to run WorldCleaner
      alerts: true #you can find in lang.yml

      #command /lagfixer clearitems
      clearitems:
        enabled: true
        abyss: #abyss is the place where all deleted items go, and players can get them back by typing the /abyss command
          enabled: false
          alerts: true #you can find in lang.yml
          permission: "lagfixer.abyss" #set this empty to disable permission
          menu_size: 54
          item_despawn: true #true = plugin will listen ItemDespawnEvent and adds to abyss inventory
          close: 30 #clear abyss inventory and disable command
          blacklist: #list of materials: https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/Material.html
            - BEDROCK
            - BEACON

      #command /lagfixer killmobs
      killmobs:
        enabled: true
        named: false #should remove named creatures
        drop_items: false #false = remove mobs without drop, true = kill mobs and drop items
        whitelist: #list of entities: https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/entity/EntityType.html
          - ZOMBIE
          - SKELETON
          - SLIME
          - CREEPER
          - SPIDER
          - PHANTOM
          - SQUID
        # - ENDERMAN
        # - SALMON
        # - COD
        # - COW
        # - PIG
        # - RABBIT

  #Beta - only for plugin developer
  CustomTracker:
    enabled: false
    worlds:
      - world
      - world_the_end
      - world_nether
    values:
      needed_mspt: 35
      check_interval: 40
      untrack_interval: 400
      disable_ticking: true
      range: 10

  #Beta - only for plugin developer
  CreatureStacker:
    enabled: false
    values:
      seach_range: 5 #the distance from which creatures are searched
      interval: -1 #-1 disables this feature
      similarity_check: true #checking the similarity between creatures, e.g. the color of wool
      whitelist: [ ]
      blacklist:
        - VILLAGER
        - ZOMBIE_VILLAGER
        - PILLAGER

Modules:

⭐ CustomAi: (Impact on performance: VERY HIGH)

Replaces creature movement to optimize and reduce behavior.
Addresses inefficiencies caused by default animal behavior like unnecessary random movements or constant looking around.
LagFixer intervenes by disabling unnecessary PathFinders or replacing them with more efficient ones.
Crucial in scenarios with numerous animals as even minor movements can strain server resources.

⭐ ItemsCleaner (Impact on performance: MEDIUM)

Cleans up old items on the ground to accelerate server performance.
Accumulation of items over time contributes to server lag, especially in densely populated or active servers.
Removes extraneous items promptly to relieve server burden.
Players can retrieve items from the Abyss inventory using the /abyss command.

⭐ EntityLimiter (Impact on performance: HIGH)

Restricts the number of entities per chunk.
Essential for survival servers with expansive animal farms.
Prevents excessive entity accumulation and associated performance issues.
Maintains stable performance levels even in environments with high entity density.

⭐ LagMonitor (Impact on performance: HIGH)

Monitors server load and adjusts settings during latency spikes.
Addresses fluctuations in server performance to mitigate delays and lag.
Dynamically adjusts settings, disables unnecessary features, and optimizes resources.
Ensures smooth gameplay by minimizing the impact of performance fluctuations.

⭐ AntiRedstone (Impact on performance: LOW)

Disables demanding Redstone clocks to prevent server overload.
Certain Redstone configurations can lead to performance degradation and crashes.
Activating AntiRedstone preserves server stability and ensures responsiveness.
Facilitates uninterrupted gameplay even with complex Redstone contraptions.

⭐ ConsoleFilter (Impact on performance: VISUAL ONLY)

Filters console messages based on predefined rules.
Enhances clarity by selectively displaying essential messages.
Reduces clutter and improves readability in multiplayer servers.
Facilitates efficient server administration and enhances the user experience for both administrators and players.

⭐ CustomVehicles (Impact on performance: LOW)

Optimizes all vehicles such as Boats and Minecarts.
Removes minecarts with chests spawned in mineshafts.
Particularly useful when minecarts are frequently used on the server.
Enhances server performance by optimizing vehicle mechanics and removing unnecessary entities.

Metrics bStats:

bStats: