diff --git a/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/ArclightConnector_1_16.java b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/ArclightConnector_1_16.java
index 5729e105..877d6e8c 100644
--- a/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/ArclightConnector_1_16.java
+++ b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/ArclightConnector_1_16.java
@@ -14,6 +14,9 @@ public class ArclightConnector_1_16 extends ArclightConnector {
         if (ArclightConfig.spec().getOptimization().isRemoveStream()) {
             Mixins.addConfiguration("mixins.arclight.impl.optimization.stream.1_16.json");
         }
+        if (ArclightConfig.spec().getOptimization().isDisableDFU()) {
+            Mixins.addConfiguration("mixins.arclight.impl.optimization.dfu.1_16.json");
+        }
         LOGGER.info("mixin-load.optimization");
     }
 }
diff --git a/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/CraftMagicNumbersMixin.java b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/CraftMagicNumbersMixin.java
new file mode 100644
index 00000000..68cc156e
--- /dev/null
+++ b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/CraftMagicNumbersMixin.java
@@ -0,0 +1,21 @@
+package io.izzel.arclight.impl.mixin.optimization.dfu;
+
+import io.izzel.arclight.i18n.ArclightLocale;
+import org.bukkit.craftbukkit.v.util.CraftMagicNumbers;
+import org.bukkit.plugin.InvalidPluginException;
+import org.bukkit.plugin.PluginDescriptionFile;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(value = CraftMagicNumbers.class, remap = false)
+public class CraftMagicNumbersMixin {
+
+    @Inject(method = "checkSupported", at = @At("HEAD"))
+    private void arclight$dfuDisabled(PluginDescriptionFile pdf, CallbackInfo ci) throws InvalidPluginException {
+        if (pdf.getAPIVersion() == null) {
+            throw new InvalidPluginException(ArclightLocale.getInstance().get("dfu-disable.legacy-plugin"));
+        }
+    }
+}
diff --git a/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/DataFixerUpperMixin.java b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/DataFixerUpperMixin.java
new file mode 100644
index 00000000..4b43844d
--- /dev/null
+++ b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/DataFixerUpperMixin.java
@@ -0,0 +1,20 @@
+package io.izzel.arclight.impl.mixin.optimization.dfu;
+
+import com.mojang.datafixers.DSL;
+import com.mojang.datafixers.DataFixerUpper;
+import com.mojang.serialization.Dynamic;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+
+@Mixin(value = DataFixerUpper.class, remap = false)
+public abstract class DataFixerUpperMixin {
+
+    /**
+     * @author IzzelAliz
+     * @reason
+     */
+    @Overwrite
+    public <T> Dynamic<T> update(DSL.TypeReference type, Dynamic<T> input, int version, int newVersion) {
+        return input;
+    }
+}
diff --git a/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/DataFixesManagerMixin.java b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/DataFixesManagerMixin.java
new file mode 100644
index 00000000..41462fd8
--- /dev/null
+++ b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/DataFixesManagerMixin.java
@@ -0,0 +1,19 @@
+package io.izzel.arclight.impl.mixin.optimization.dfu;
+
+import com.mojang.datafixers.DataFixer;
+import com.mojang.datafixers.DataFixerBuilder;
+import net.minecraft.util.SharedConstants;
+import net.minecraft.util.datafix.DataFixesManager;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(DataFixesManager.class)
+public class DataFixesManagerMixin {
+
+    @Inject(method = "createFixer", cancellable = true, at = @At("HEAD"))
+    private static void arclight$disableDfu(CallbackInfoReturnable<DataFixer> cir) {
+        cir.setReturnValue(new DataFixerBuilder(SharedConstants.getVersion().getWorldVersion()).build(r -> {}));
+    }
+}
diff --git a/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/EntityType_BuilderMixin.java b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/EntityType_BuilderMixin.java
new file mode 100644
index 00000000..b4446485
--- /dev/null
+++ b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/EntityType_BuilderMixin.java
@@ -0,0 +1,46 @@
+package io.izzel.arclight.impl.mixin.optimization.dfu;
+
+import com.google.common.collect.ImmutableSet;
+import net.minecraft.block.Block;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.EntityClassification;
+import net.minecraft.entity.EntitySize;
+import net.minecraft.entity.EntityType;
+import net.minecraft.world.World;
+import net.minecraftforge.fml.network.FMLPlayMessages;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+
+import java.util.function.BiFunction;
+import java.util.function.Predicate;
+import java.util.function.ToIntFunction;
+
+@Mixin(EntityType.Builder.class)
+public class EntityType_BuilderMixin<T extends Entity> {
+
+    @Shadow private boolean serializable;
+    @Shadow @Final private EntityType.IFactory<T> factory;
+    @Shadow @Final private EntityClassification classification;
+    @Shadow private boolean summonable;
+    @Shadow private boolean immuneToFire;
+    @Shadow private boolean field_225436_f;
+    @Shadow private EntitySize size;
+    @Shadow private Predicate<EntityType<?>> velocityUpdateSupplier;
+    @Shadow private ToIntFunction<EntityType<?>> trackingRangeSupplier;
+    @Shadow private ToIntFunction<EntityType<?>> updateIntervalSupplier;
+    @Shadow private BiFunction<FMLPlayMessages.SpawnEntity, World, T> customClientFactory;
+    @Shadow private int field_233605_i_;
+    @Shadow private int trackingRange;
+    @Shadow private ImmutableSet<Block> field_233603_c_;
+
+    /**
+     * @author Izzel_Aliz
+     * @reason
+     */
+    @Overwrite
+    public EntityType<T> build(String id) {
+        return new EntityType<>(this.factory, this.classification, this.serializable, this.summonable, this.immuneToFire, this.field_225436_f, this.field_233603_c_, this.size, this.trackingRange, this.field_233605_i_, velocityUpdateSupplier, trackingRangeSupplier, updateIntervalSupplier, customClientFactory);
+    }
+}
diff --git a/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/MinecraftServerMixin.java b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/MinecraftServerMixin.java
new file mode 100644
index 00000000..33dafc0e
--- /dev/null
+++ b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/MinecraftServerMixin.java
@@ -0,0 +1,21 @@
+package io.izzel.arclight.impl.mixin.optimization.dfu;
+
+import io.izzel.arclight.i18n.ArclightLocale;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.world.storage.SaveFormat;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(MinecraftServer.class)
+public abstract class MinecraftServerMixin {
+
+    @Inject(method = "func_240777_a_", cancellable = true, at = @At("HEAD"))
+    private static void arclight$skipConvert(SaveFormat.LevelSave levelSave, CallbackInfo ci) {
+        if (levelSave.isSaveFormatOutdated()) {
+            throw new RuntimeException(ArclightLocale.getInstance().get("dfu-disable.map-convert"));
+        }
+        ci.cancel();
+    }
+}
diff --git a/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/TileEntityTypeMixin.java b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/TileEntityTypeMixin.java
new file mode 100644
index 00000000..a9173816
--- /dev/null
+++ b/arclight-forge-1.16/src/main/java/io/izzel/arclight/impl/mixin/optimization/dfu/TileEntityTypeMixin.java
@@ -0,0 +1,20 @@
+package io.izzel.arclight.impl.mixin.optimization.dfu;
+
+import net.minecraft.tileentity.TileEntity;
+import net.minecraft.tileentity.TileEntityType;
+import net.minecraft.util.registry.Registry;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+
+@Mixin(TileEntityType.class)
+public class TileEntityTypeMixin {
+
+    /**
+     * @author IzzelAliz
+     * @reason
+     */
+    @Overwrite
+    private static <T extends TileEntity> TileEntityType<T> register(String key, TileEntityType.Builder<T> builder) {
+        return Registry.register(Registry.BLOCK_ENTITY_TYPE, key, builder.build(null));
+    }
+}
diff --git a/arclight-forge-1.16/src/main/resources/mixins.arclight.impl.optimization.dfu.1_16.json b/arclight-forge-1.16/src/main/resources/mixins.arclight.impl.optimization.dfu.1_16.json
new file mode 100644
index 00000000..1ff6605b
--- /dev/null
+++ b/arclight-forge-1.16/src/main/resources/mixins.arclight.impl.optimization.dfu.1_16.json
@@ -0,0 +1,14 @@
+{
+  "minVersion": "0.8",
+  "package": "io.izzel.arclight.impl.mixin.optimization.dfu",
+  "target": "@env(DEFAULT)",
+  "refmap": "mixins.arclight.impl.refmap.1_15.json",
+  "mixins": [
+    "CraftMagicNumbersMixin",
+    "DataFixerUpperMixin",
+    "DataFixesManagerMixin",
+    "EntityType_BuilderMixin",
+    "MinecraftServerMixin",
+    "TileEntityTypeMixin"
+  ]
+}
\ No newline at end of file
diff --git a/i18n-config/src/main/java/io/izzel/arclight/i18n/conf/OptimizationSpec.java b/i18n-config/src/main/java/io/izzel/arclight/i18n/conf/OptimizationSpec.java
index 60595ca7..400749d5 100644
--- a/i18n-config/src/main/java/io/izzel/arclight/i18n/conf/OptimizationSpec.java
+++ b/i18n-config/src/main/java/io/izzel/arclight/i18n/conf/OptimizationSpec.java
@@ -12,6 +12,9 @@ public class OptimizationSpec {
     @Setting("cache-plugin-class")
     private boolean cachePluginClass;
 
+    @Setting("disable-data-fixer")
+    private boolean disableDFU;
+
     public boolean isRemoveStream() {
         return removeStream;
     }
@@ -19,4 +22,8 @@ public class OptimizationSpec {
     public boolean isCachePluginClass() {
         return cachePluginClass;
     }
+
+    public boolean isDisableDFU() {
+        return disableDFU;
+    }
 }
diff --git a/i18n-config/src/main/resources/META-INF/arclight.conf b/i18n-config/src/main/resources/META-INF/arclight.conf
index 9f55a453..f44aa9ec 100644
--- a/i18n-config/src/main/resources/META-INF/arclight.conf
+++ b/i18n-config/src/main/resources/META-INF/arclight.conf
@@ -6,6 +6,7 @@ locale {
 optimization {
   remove-stream = true
   cache-plugin-class = true
+  disable-data-fixer = false
 }
 compatibility {
   material-property-overrides {
diff --git a/i18n-config/src/main/resources/META-INF/i18n/en_us.conf b/i18n-config/src/main/resources/META-INF/i18n/en_us.conf
index d2d1059d..9f29be87 100644
--- a/i18n-config/src/main/resources/META-INF/i18n/en_us.conf
+++ b/i18n-config/src/main/resources/META-INF/i18n/en_us.conf
@@ -74,6 +74,10 @@ registry {
     error = "{} prodived entityClass {} is invalid: {}"
   }
 }
+dfu-disable {
+  legacy-plugin = "Legacy plugin is not allowed when optimization.disable-data-fixer is enabled"
+  map-convert = "World upgrading is not allowed when optimization.disable-data-fixer is enabled"
+}
 
 comments {
   _v.comment = [
@@ -84,7 +88,15 @@ comments {
     "Config version number, do not edit."
   ]
   locale.comment = "Language/I18n settings"
-  optimization.comment = "Optimization related settings"
+  optimization {
+    comment = "Optimization related settings"
+    disable-data-fixer.comment = [
+      "Disable the DataFixerUpper system which is used for level data upgrading"
+      "This can hopefully speedup startup and world load and reduce memory usage of 80-200mb"
+      "Arclight and its developers are not reponsible for any data loss or corruption"
+      "DO NOT USE IN PRODUCTION!"
+    ]
+  }
   async-catcher.comment = [
     "Async Catcher related settings"
     "There are four modes, and BLOCK is recommended"
diff --git a/i18n-config/src/main/resources/META-INF/i18n/zh_cn.conf b/i18n-config/src/main/resources/META-INF/i18n/zh_cn.conf
index 3eab5484..a08e48a8 100644
--- a/i18n-config/src/main/resources/META-INF/i18n/zh_cn.conf
+++ b/i18n-config/src/main/resources/META-INF/i18n/zh_cn.conf
@@ -74,6 +74,10 @@ registry {
     error = "{} 提供的 entityClass {} 无效: {}"
   }
 }
+dfu-disable {
+  legacy-plugin = "Legacy 插件在 optimization.disable-data-fixer 启用时不可用"
+  map-convert = "地图升级转换在 optimization.disable-data-fixer 启用时不可用"
+}
 
 comments {
   _v.comment = [
@@ -84,7 +88,15 @@ comments {
     "配置文件版本号，请勿编辑"
   ]
   locale.comment = "语言/国际化相关设置"
-  optimization.comment = "服务端优化相关设置"
+  optimization {
+    comment = "服务端优化相关设置"
+    disable-data-fixer.comment = [
+      "关闭用于升级存档数据的 DataFixerUpper 系统"
+      "这将可能加快启动速度和地图加载速度，并减少 80-200mb 的内存占用"
+      "Arclight 及其开发者不对任何数据丢失或损害负责"
+      "请不要在生产环境中使用"
+    ]
+  }
   async-catcher.comment = [
     "异步捕获相关设置"
     "Async Catcher 共有四种模式"