Hello,
1) Please check this article or plugin: http://diywpblog.com/wordpress-optimization-remove-query-strings-from-static-resources/ http://wordpress.org/plugins/remove-query-strings-from-static-resources/ 2) Please check this article https://makeaweblog.com/how-to-leverage-browser-caching-in-wordpress/ 3) You can optimize images using special services – tinypng.com – Compressor.io – Kraken.io – Ewww Image Optimizer – Smush Image Compression and Optimization plugin
Regards
