Also cook your water in a very thin pot, don't go for the thick bottomed pots as the water can change temp easily and it takes longer to go back, whereas it seems to do more of a rolling boil with a thin pot. sounds bizarre but it's true!
My Italian stepfather has a motto with pasta - "You should always wait for the pasta. Never make the pasta wait for you."
He never adds anything but a pinch of salt to his water to boil and serves the pasta immediately. I think that the brand of pasta you buy makes a difference too.
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