Not Sure if the Chaching is working

I downloaded the pluggin last week. How can i tell if it is working properly. http://www.giglinxusa.com

My load time hasnt improved according to Alexa, still showing Very Slow (3.814 Seconds).

Also pretty bad according to google https://developers.google.com/speed/pagespeed/insights/?url=giglinxusa.com

I appreciate any feedback.

https://wordpress.org/plugins/wp-super-cache/