diff --git a/worlds/Files.py b/worlds/Files.py
index ac1acbf32248..52d3c7da1d35 100644
--- a/worlds/Files.py
+++ b/worlds/Files.py
@@ -2,11 +2,18 @@
 
 import json
 import zipfile
+import os
+import threading
 
 from typing import ClassVar, Dict, Tuple, Any, Optional, Union, BinaryIO
 
 import bsdiff4
 
+semaphore = threading.Semaphore(os.cpu_count() or 4)
+
+del threading
+del os
+
 
 class AutoPatchRegister(type):
     patch_types: ClassVar[Dict[str, AutoPatchRegister]] = {}
@@ -57,11 +64,12 @@ def write(self, file: Optional[Union[str, BinaryIO]] = None) -> None:
         zip_file = file if file else self.path
         if not zip_file:
             raise FileNotFoundError(f"Cannot write {self.__class__.__name__} due to no path provided.")
-        with zipfile.ZipFile(zip_file, "w", self.compression_method, True, self.compression_level) \
-                as zf:
-            if file:
-                self.path = zf.filename
-            self.write_contents(zf)
+        with semaphore:  # TODO: remove semaphore once generate_output has a thread limit
+            with zipfile.ZipFile(
+                    zip_file, "w", self.compression_method, True, self.compression_level) as zf:
+                if file:
+                    self.path = zf.filename
+                self.write_contents(zf)
 
     def write_contents(self, opened_zipfile: zipfile.ZipFile) -> None:
         manifest = self.get_manifest()