Slow (old) Windows context menu for several media files, but not all media file types.

Using the old context menu in Windows 11, or Nilessoft Shell, I experience the context menu to be slow for media files like mp3, mp4, mkv, mpg etc. But not all media, like aiff, that is instant. Changing a mp4 to .aiff, and the menu in instant.

Any idea how to solve this?