diff --git a/server.py b/server.py
index 85a8964be..a8dc4a7d5 100644
--- a/server.py
+++ b/server.py
@@ -403,11 +403,19 @@ class PromptServer():
                 if overwrite is not None and (overwrite == "true" or overwrite == "1"):
                     pass
                 else:
+                    # Get uploaded file size once  
+                    image.file.seek(0, 2)  # Seek to end  
+                    uploaded_size = image.file.tell()  
+                    image.file.seek(0)  # Reset to beginning  
+                    
                     i = 1
                     while os.path.exists(filepath):
-                        if compare_image_hash(filepath, image): #compare hash to prevent saving of duplicates with same name, fix for #3465
-                            image_is_duplicate = True
-                            break
+                        # Quick size comparison first  
+                        existing_size = os.path.getsize(filepath)  
+                        if existing_size == uploaded_size:
+                            if compare_image_hash(filepath, image): #compare hash to prevent saving of duplicates with same name, fix for #3465
+                                image_is_duplicate = True
+                                break
                         filename = f"{split[0]} ({i}){split[1]}"
                         filepath = os.path.join(full_output_folder, filename)
                         i += 1