Sloppy performance with 2nd display

I decided to invest in a mini-display port to VGA cable in order to hook up my Dell 20" monitor to my 21.5" iMac.
I wasn't too happy to discover the drop in performance just from doing so. Now whenever I am using the expose features, the windows move about on screen at a disgustingly jerky rate, it was fine before I hooked up a second monitor. Also, when I drag a window from one display to the other it is generally quite jerky for the first second or two.
Could it be that I'm using an unofficial display cable? :
http://www.amazon.co.uk/exec/obidos/ASIN/B002ERZ5YI/ref=pdluc_mri?encoding=UTF8&m=A1T39SA8AUFT6J
I bought this one after reading good reviews on Amazon, although if I'd have realised at the time that an official one was the same price then I would have bought that.
I'm considering buying an official cable and trying that, but I'll be shocked if it improves the performance.
I've used dual monitors on (far cheaper) PC's before with no qualms whatsoever so I don't see why an iMac shouldn't be able to handle the same thing. I might also add that I didn't have to fork out an extra £20 purely for a cable to connect a second monitor! What a joke.

Apple had some issues with their m-DP to VGA adapter last year and had to issue a firmware update to get the adapter to perform better. Perhaps the manufacturer of this adapter has not got it right yet as well. Have you checked the Neet website or support line to see if they may have some sort of update as well?
Dah•veed

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