Resources - Upgrade PHP
PHP Optimization
Running an updated version of PHP (PHP 5.4) on your hosting account can slow your website down by 50% or more. You want to be upgrade to PHP 7.1. The upgrade is totally safe and does not effect your website content at all. If for some reason your website is not compatible with PHP 7.1, simply set your PHP version back to PHP 5.4,
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STEP #2
STEP #3