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Really slow GLSL array access

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Is it just me, or is accessing an array with a non-constant value in GLSL extremely slow. float testArray[10]; int index = 8; float blah = testArray[index]; This brings my framerate down to about 0.5 FPS (on a x800xt pe) Equivelent code runs at a fine speed in Cg. (And I assumed the code would get compiled to very simmilar assembly anyway) Any ideas? thanks,

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