Cache Management
Cpnginx support three type of cache; proxy cache, fcgi cache and google page speed .
Proxy Cache
Server administrator can enable or disable the proxy cache from settings. Enabling cache will speed up your websites. But you need to handle the cache properly, some websites may not show recent updates due to cache. But no worries, from the cpanel interface, each user can disable or enable the proxy cache.
Fcgi Cache
This is the php-fpm cache. Enabling this micro cache also speed up the websites but it should be configured properly. End users can also enable or disable the fcgi cache for their website, if it is enabled by admin.
Google page Speed
Please refer the above given documentation for google page speed.