[Xenon]

Well, you won't see any difference, visually
it just reduces the querie ammount if it reads from the cache.

The cache would be updated, whenever a new post is made, that's also how you force an update

so if you've installed the newest version, go to forumhome, you'll have about 19 queries (normally) then just do a reload, without a new post has been made, and the qurey ammount should be about 14.
if you don't have the effect, you have probably made a mistake while installing