We've enable litespeed cache on a living vB seo site successfully, the load dropped a lot during peak time, response has become faster.
vBulletin 4.1.2
vBSEO 3.6.0
litespeed 4.0.20
1. the cache plugin for vBulletin 3/4
<?xml version="1.0" encoding="ISO-8859-1"?>
<product...