Make my wordpress website load much faster

So i have created a tourist site for visitors of Bergen, Norway at http://www.thingstodoinbergen.com. The site has sliders and some pages have a lot of images. I have compressed all the images, installed autoptimize, BJ lazy load, instantclick, W3 Total Cache and warm cache. The site still loads each page around 7 seconds. I would like to get the page loading around 3 seconds. I have checked out the waterfall view on [login to view URL] and i'm not sure what else i can do to help improve the load times. Must have experience working with web page optimisation. I have attached the grades of the page from the [login to view URL] site