Prestashop 1.5.4.1 . Has to be ASAP
We just installed a new theme withs is very slow.
Google developers found 17 mistakes.
Before we put the new theme online the website was very fast, we tested the theme on a test site before going onlie (same host) and it worked fine there.
We are working on this the with the same mistakes but we also have cache problems wits is the biggest.