code: def freeze_extensions(self):
          
  
          output_path = os.path.join(_registry_folder(), 'frozen_extensions.json')
  
          with open(output_path, "w") as outfile:
              json.dump(self._dump_extensions(), outfile)
docs: Freeze the set of extensions into a single file.
  
          Freezing extensions can speed up the extension loading process on
          machines with slow file systems since it requires only a single file
          to store all of the extensions.
  
          Calling this method will save a file into the current virtual
          environment that stores a list of all currently found extensions that
          have been installed as entry_points.  Future calls to
          `load_extensions` will only search the one single file containing
          frozen extensions rather than enumerating all installed distributions.