I'm searching the web for a definitive solution to the "problem" that google reports when i test the speed of my site on Google PageSpeed. Magento's JS and CSS block the above-the-fold view and I tried some solutions like inserting the async or defer attribute to js and css, but the result was that when the page was loaded in the browser console, several JS errors were reported including "Mage is not defined" and others of this type.
I also tried to compress js and css but without result.
What other solution could I test? Thanks