Jamba crashing game

[Noids]

RAM usage for me sits at around 25-30% of my 12GB normally. This is a completely new problem for me today after patching.

The performance in Dal and in general I was referring to is simply lower than expected fps (in the 20s generally) for an i920, 12GB GTX 295 SSD type system. I had purchased the SSDs to be used for WoW primarily and installed the game on them so was surprised to see in the error that a file on my D drive was the one requesting the memory allocation. Even more surprising is that I do not have a directory on my D drive named D:\buildserver which is whatled me to question the WTF virtualisation of Innerspace. I am an experienced computer user but have no experience with any sort of software programming etc. so I am assuming there is a logical explanation for this. I don't really know where to look further for this problem without being able to physically find the error in question though and was hoping you guys could shed some light on what was setting up files on a disk other than the one on which my WoW folder and addons sits.

Edit: Trying to replicate the error now. Haven't managed to as yet but started my 5 man team, all logged in fine to Dalaran, RAM at 48%. PiP switch back to my main frmo my 5th toon logged in and very slow switch, screen switches to the main section but remains at its small size in the top left corner and it is locked up but won't crash this time. Mem useage slowly climbs to 55% and plateaus at this. Started task manager and have 5 instances of WoW running. 4 of them are using about 600k but one is up to 1.2MB. This process is my window 1 which is playing up.