I see you’re using a minification system for js, html and css – what are you using? I have had good experiences on all my sites with the W3 Total Cache plugin.
I also ran your site through webpagetest.org and it looks like your images, particularly the png file of bg_dark_man are taking a long time to load. I would compress the images either manually or by using a the Smush It plugin.
The waterfall graph shows your html and css files are taking a long time to load as well – did you run your code through the W3C validator (https://validator.w3.org/) to make sure there isn’t any code holding you up?