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ray-triangle intersection

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Hi, I need a high-speed ray-triangle intersection algorithm. By now, I know three of them, but even the faster one, that I used without understanding it, is still too slow for my pourposes. Does someone know a very fast method or a way to improve the performance on a single intersection event? In fact, currently my ray tracer renders a simple scene (3 triangles and 2 lights) at 640*480 in 0.8 sec (0.5 if only casted shadows are computed) on a Athlon 1400 Mhz. I''m pretty sure it could be made real-time, even if I don''t know how. Any suggests?

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