I run a Xenforo forum that gets about 60-120 users at a time, depending on time of day. And after the first day of running the forum, servers loads have being extremely high: spiking up to 16 on a 4 core system at times. The memory shows about 60% use at max, so it's not a problem there. Using top in ssh shows the problem to be php. It constitutes the majority of the high cpu load processes. What can i do to help alleviate this problem? I'm a complete noob at running a VPS, btw, so please answer in layman's terms.