How 2D in 3D (Anthony Flack's Cletus)?

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Ok Anthony I have another question ;)
I noticed in your Cletus game you had a nice background. I'm trying to stretch an image the size of the screen but I get that annoying slowdown you get when the fill rate is full. Or something like that.
I've tried splitting it up into 4 smaller quads but I still get the same slowdown.
How did you manage to get around this, am I on the right lines, should I segment more?