diff --git a/audiobook_metadata/metadata_audiobooks_library.py b/audiobook_metadata/metadata_audiobooks_library.py
index 666a67d..1d14050 100755
--- a/audiobook_metadata/metadata_audiobooks_library.py
+++ b/audiobook_metadata/metadata_audiobooks_library.py
@@ -9,6 +9,7 @@ import json
 from pathlib import Path
 from typing import Any
 from collections import defaultdict
+from concurrent.futures import ThreadPoolExecutor, as_completed
 
 RED = "\033[91m"
 GREEN = "\033[92m"
@@ -542,13 +543,33 @@ class AudiobookLibrary:
             audiobooks.extend(self.find_name_contains(name))
         if not name and not path:
             audiobooks = self.audiobooks
-        for audiobook in audiobooks:
-            if audiobook.singleFile:
-                continue
-            logger.debug(f"Crate m4b file for {audiobook.name}")
-            if self.dry_run:
-                continue
-            audiobook.create_m4b_from_book( self.libraryPath,create_m4b_no_delete)
+
+        jobs = [
+            audiobook
+            for audiobook in audiobooks
+            if not audiobook.singleFile
+        ]
+
+        for audiobook in jobs:
+            logger.debug(f"Create m4b file for {audiobook.name}")
+
+        if not self.dry_run:
+            with ThreadPoolExecutor(max_workers=8) as executor:
+                futures = {
+                    executor.submit(
+                        audiobook.create_m4b_from_book,
+                        self.libraryPath,
+                        create_m4b_no_delete,
+                    ): audiobook
+                    for audiobook in jobs
+                }
+
+                for future in as_completed(futures):
+                    audiobook = futures[future]
+                    try:
+                        future.result()
+                    except Exception:
+                        logger.exception(f"Failed to create m4b for {audiobook.name}")
 
 def ffmpeg_escape(path: Path) -> str:
     return str(path.resolve()).replace("'", r"'\''")