I am building my website using TheSeven theme, with Visual Composer and Ultimate Addons For VC plugins. But my website run very very slow. It takes 6-7 seconds or sometimes higher to load my homepage: here is my homepage
I use google Pagespeed to test the website and optimized according to suggestions. But I cannot solve the "response time" problem. I use the same host service for another website and it run very fast. They said that my website consume a lot of resource, so the server cannot response as fast as normal. I am also suggested to change theme because my theme is heavy.
When I used Chrome Tool TimeLine to test my website, it shows a lot of "Recalculate Style" parts, with a warning "forced re-flow is likely a performance bottleneck". But I don't really understand.
What could be my main problem? Could it be caused by hosting, or it's because my theme is too heavy?