diff --git a/src/main/java/org/embeddedt/modernfix/mixin/perf/parallelize_model_loading/OBJLoaderMixin.java b/src/main/java/org/embeddedt/modernfix/mixin/perf/parallelize_model_loading/OBJLoaderMixin.java
new file mode 100644
index 00000000..8ab74574
--- /dev/null
+++ b/src/main/java/org/embeddedt/modernfix/mixin/perf/parallelize_model_loading/OBJLoaderMixin.java
@@ -0,0 +1,32 @@
+package org.embeddedt.modernfix.mixin.perf.parallelize_model_loading;
+
+import net.minecraft.util.ResourceLocation;
+import net.minecraftforge.client.model.obj.MaterialLibrary;
+import net.minecraftforge.client.model.obj.OBJLoader;
+import net.minecraftforge.client.model.obj.OBJModel;
+import org.objectweb.asm.Opcodes;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+@Mixin(OBJLoader.class)
+public class OBJLoaderMixin {
+    @Shadow private Map<ResourceLocation, MaterialLibrary> materialCache;
+
+    @Shadow private Map<OBJModel.ModelSettings, OBJModel> modelCache;
+
+    @Redirect(method = "<init>", at = @At(value = "FIELD", opcode = Opcodes.PUTFIELD, target = "Lnet/minecraftforge/client/model/obj/OBJLoader;materialCache:Ljava/util/Map;"))
+    private void useConcMap1(OBJLoader instance, Map<ResourceLocation, MaterialLibrary> value) {
+        this.materialCache = new ConcurrentHashMap<>();
+    }
+
+    @Redirect(method = "<init>", at = @At(value = "FIELD", opcode = Opcodes.PUTFIELD, target = "Lnet/minecraftforge/client/model/obj/OBJLoader;modelCache:Ljava/util/Map;"))
+    private void useConcMap2(OBJLoader instance, Map<ResourceLocation, MaterialLibrary> value) {
+        this.modelCache = new ConcurrentHashMap<>();
+    }
+}
diff --git a/src/main/resources/modernfix.mixins.json b/src/main/resources/modernfix.mixins.json
index c201dcfc..9f4721bf 100644
--- a/src/main/resources/modernfix.mixins.json
+++ b/src/main/resources/modernfix.mixins.json
@@ -23,6 +23,7 @@
     "bugfix.concurrency.RenderTypeMixin",
     "bugfix.concurrency.MinecraftMixin",
     "perf.parallelize_model_loading.ModelBakeryMixin",
+    "perf.parallelize_model_loading.OBJLoaderMixin",
     "perf.trim_model_caches.ModelManagerMixin",
     "perf.async_jei.IngredientListElementFactoryMixin",
     "perf.async_jei.ClientLifecycleHandlerMixin",