If you control the deploying process and the web server (at least with Nginx), you can disable gzip for the small files (like the article has), and avoid on-the-fly compressing for the larger files.

    location /js/small {
      gzip off;
    }
    location /js/ {
      gzip on;
      # Use the .gz file if it exists
      gzip_static on;
    }