Which one do I recommend: https://youtu.be/wql8dXD4h4s?t=7m6s
If you are looking to speed up your website to less than 2 seconds, watch this video or read the blog post where I test 15 different caching plugins with the Divi theme by elegant themes.
The best performing caching plugin is: https://wp-rocket.me/
The best free plugin was: https://wordpress.org/plugins/wp-fastest-cache/
The next best plugins were Wordfence and A2 Optimized Cache. Simple Cache was all over the place so I couldn’t recommend it. Finally, WP Super Cache, Gator Cache and W3 Total Cache came in at 1.6 seconds.
**Wordfence announced they are removing their falcon caching engine so I can’t recommend anymore obviously.
The rest allowed me to get better speed but I was disappointed by Hummingbird by WPMU. I have a feeling it works great on WPMU themes but maybe not as well on others.
You can see all the results and how I configured them by going to my blog at: http://onlinestorehelp.com/caching-plugins-with-divi-by-elegant-themes/