It is possible to get dramatic speed improvements on your website by enabling the PHP Opcache module. Some sources reports speed increases of upto 3x with OPcache enabled WordPress websites
OPcache is a caching system that saves precompiled script in server memory, so each time a user visits a web page, it loads faster.
Login to cPanel Control Panel
How to: Login to your Web Hosting account
Navigate to PHP Switcher
This can be found under the Software heading > Select PHP Version
Enable module ‘opcache’
The module will be enabled automatically without clicking save.