Homepage created in visual composer not reducing page load speed

Hi we are using vibethemes which has recently released updated version which is compatible with total cache 3. http://vibethemes.com/documentation/wplms/knowledge-base/wplms-with-w3-total-cache/ . If we are using default page builder which comes with theme we are able to get page load speed time within 3-4 secs but IF WE USE VISUAL COMPOSER TO CREATE THE SAME HOMEPAGE WE GET PAGE LOAD SPEED 10 SECS AND ABOVE. Need help to achieve the page load speed within 2-3 secs via creating homepage via visual composer.

https://wordpress.org/plugins/w3-total-cache/