WP Fastest Cache does not create cache by default if a url contains a query string.
If you want to enable cache system for the urls which contain querystring, you need to add the following line after <?php which exists at the top of wp-config.php file.
define('WPFC_CACHE_QUERYSTRING', true);
You can write your own function that will modify the content of minified or combined css sources before saving.
Google recommends to load the JavaScripts after html, css and images.
There is no .htaccess file in Nginx servers so WP Fastest Cache cannot set the gzip rules. Therefor, you must…
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