ATI GPU chips tend to run hot, and tend to be very sensitive to air circulation issues.
The HD 5850 is one of the cooler running GPUs currently still available, though I'm not sure about the mobile version.
And as you do use the mobile version, I assume you also use a laptop to run the game. I've had similar problems with my laptop, though not for WoW but mainly in first person shooters. The general cooling solution simply wasn't completely thought through, and the accumulated heat from both the CPU and the GPU simply was too much for the tiny fans to handle.
You should absolutely keep an eye on the temperatures of both your CPU and GPU while you're playing the game. For the CPU there are tools like RealTemp, and for the GPU I like to use GPU-Z for such monitoring issues (since it also features logging).
This is simple but it may prove very important to anyone that had it slip their mind and they are dealing with temperature issues. It might be also useful to anyone that does not have any actual problems but wants to prolong the lifetime of their machine by running it cooler in general: This game as most games is governed largely by the same global loop that governs FPS on the screen. Yes, there appears to be partially some multi-threading but it appears it is nowhere near the impact the global loop of frames inflicts. Hence, if one wants to lower CPU time, they can simply lower the FPS. Probably the most elegant way to use it is to use vertical sync (if that is lower than the usual FPS). Vertical sync will inflict some extra visual latency, which is mainly regarded bad in first person shooters or even any other game partially, but since one may lose some of the visual latency advantages, they might as well vsync for smoother rendering, which can be easily observed on sudden camera changes, especially on low frequency displays.
IDs of posters on battle.net forums are the same across all characters of an account.
I did a domain search for this information and nothing came up. It is very mildly related to this thread and it might not deserve its own thread or a thread resurrection. Please feel free to delete it or move it if it's deemed necessary.
What basically happens is that in the latest version of the battle.net forum, an ID number related to the ignore functionality in the source code of a page is the same across all posts of all characters of an account. This means one can manually look up alts and find out who their mains are by comparing threads posts. There are also addons that claim to do it automatically here.
I find this information very important for the WoW community for a reason one might not think at first: Yes it might stop excessive "trolling" but the most important effect of it is that there is no anonymity for people that want to keep it, unless they only post with alts. There are cases - for example when one is seeking guild leadership advice - one may want to keep civility with anonymity without having sinister objectives, and this information should be important for them.
I'd love to post something helpful to others, but the fact is, I'm here to ask for input.
In short, I'm sick of feeling like I'm swimming through molasses when I fight Deathwing. I can barely get Hleap to go off, let alone in the right location... LET ALONE fast enough to get in on the aoe damage to make some big numbers. I'm slow, I'm late, I fall off cliffs, and I'm not going to be worth a raid spot for next progression unless !@#$ changes.
I want more than to be able to click my buttons and actually see responsiveness, I want to fraps and stream and maybe make some hot kill videos for my guild.
I've tried a lot of the usual tricks, disabling addons, background programs, lowering graphics, increasing performance seettings, and upgrading my internet speed, but the problem is not resolved. What do I need?
Here's what I have:
mobo: N-Alvorix-RS880-uATX (Alvorix)
CPU: AMD Phenom 2 X6 1045t
Graphics card: ATI Radeon HD 5700 series
8G RAM DDR3-1333
2 mechanical HD's: 1.3T and 13G
Windows 7 64 bit
I uninstalled all antivirus software.
ANY advice would be appreciated. I can afford better parts, which I am sure is needed, but what?
Pretty standard advice, I know, but update your CPU.
I haven't used an AMD in years, so I can't give you any advice on that. I can only tell from my personal experiance, which is that I can fraps and raid just fine on my overclocked Intel 2500k @4.0 in 1920x1080. My other specs are quite similar to yours (OS, RAM, graphics cards).
Tom's Hardware did a checkup on the release of Cataclysm, which showed Intel CPUs to be generally performing better than AMD. That may have changed of course, but maybe that review contains other information also helpful to you.