I have done some speed tests with this. It says that I should try to minify JS, CSS files and eliminate render-blocking javascript and csse in above-th-fold content. I’m using W3 Total Cache plugin for optimization, but there are some errors minifying CSS and JS. And I have no clue how to eliminate render-blocking JS and CSS. Is there good solutions for this kind of case? Is there some critical JS and CSS files that I shouldn’t try to minify (so I can ignore them)?
All files are important and trying to minify them it is not the best idea. As it could bring malfunction your layout. I suggest you to read this article to learn what you can do to optimize site.
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