slow loading

Hello! I love this theme, but there’s just one thing that I really hate: the first time when youn open the site is very slow loading pages ( i guess because it loads all contents before show everything. I tried to disable plugin and “clean” as much as I can… is there something I can do? In the past I used another template (not so nice as this one) but very quick.. I don’t want to change it again! Any idea? thanks