Lower compress level for image preview.

nodes.py

@@ -1337,6 +1337,7 @@ class SaveImage:
         self.output_dir = folder_paths.get_output_directory()
         self.type = "output"
         self.prefix_append = ""
+        self.compress_level = 4
 
     @classmethod
     def INPUT_TYPES(s):
@@ -1370,7 +1371,7 @@ class SaveImage:
                         metadata.add_text(x, json.dumps(extra_pnginfo[x]))
 
             file = f"{filename}_{counter:05}_.png"
-            img.save(os.path.join(full_output_folder, file), pnginfo=metadata, compress_level=4)
+            img.save(os.path.join(full_output_folder, file), pnginfo=metadata, compress_level=self.compress_level)
             results.append({
                 "filename": file,
                 "subfolder": subfolder,
@@ -1385,6 +1386,7 @@ class PreviewImage(SaveImage):
         self.output_dir = folder_paths.get_temp_directory()
         self.type = "temp"
         self.prefix_append = "_temp_" + ''.join(random.choice("abcdefghijklmnopqrstupvxyz") for x in range(5))
+        self.compress_level = 1
 
     @classmethod
     def INPUT_TYPES(s):