That is precisely why I personally avoid FFXIclopedia. There was (and may still be) something on that site that would routinely max out my laptop's cpu. ABP fixed it totally for me, so it was likely an issue with certain ads or the like... Wouldn't be surprised if the same type of thing is happening to you. That site appears to be working fine on my end btw, so odds are it's either an issue with certain ads like mine was, or maybe some sort of machine specific problem. I suggest you try using AdBlockPlus first, then if that doesn't work, try clearing your browser cache.