Ultraxion destroys recount and all other heavy-parsing addons, primarily due to the buff crystals he spawns (the duplicated healing one is the killer).
But, let's discuss your system. First, the CPU you're using is only a dual core, and a very old one at that. Originally released in 2006 under the "Windsor" codename (
Source), it's not been good since at least the Intel Core 2 days (around 2008). Essentially, it's a case of outdated hardware, and it's really holding you back. It's on a now-defunct platform commonly known as "Socket 940" (
not AM2, though both have 240 pins, they are incompatible) and as such no upgrades are available for it. As it's dual core, it's going to limit WoW, though this in itself would not cause a major FPS drop if the chip was newer. 3 cores is ideal for WoW, and 4 makes sure the rest of your system doesn't get choked when WoW is running by competing for CPU time on the available cores.
The 4850 you have isn't the worlds greatest card, nor is it new, but it should suffice.
Essentially, your CPU is lacking any sort of power in todays gaming market and it's the absolute low end, though due to it's age is not supported much by modern games. You have a few options, but all of them revolve around either replacing the whole system, or replacing a large part of it with newer components. Before we can make any recommendations on what to buy, we'd really need to know a budget. I should probably tell you to create a new thread regarding what to buy, but i think we can use this as a base for suggestions and then move onto a thread that refines it once we've got some specifics down.