Hello, I am a software developer with more than 10 years experience, expert in Prestashop, working every day on prestashop development and optimization (PageSpeed google insights, pingdom tools, webpagetest). I know how to optimice and win several seconds in load time, like modifying htaccess, installing php extensions in server, minifying and compressing files, using cache systems, optimizing images, updating php engine and some other strategies in Prestashop which can make your pages much faster in load time.
This is a professional development, I can show you some pages I have optimized usgin prestashop 1.6, if you are interested, please contact me so we can talk about details.
Best regards.