Hi, just a single website on a Cloud server, plenty of memory etc. I can adjust resources as much as I want if that would help. Which ones should I look at?

Server OS: Linux 3.10.0-229.14.1.el7.centos.onapp.x86_64
HTTP Server: Apache
PHP Version: 5.6.30 (Zend: 2.6.0)
PHP Memory Limit: 128M
Database: MySQL 5.5.5-10.1.22-MariaDB
Database Data Size: 95,400 kB
Database Index Size: 24,807 kB