Comment #9 on issue 2607 by [email protected]: as_numer_denom() is too slow
http://code.google.com/p/sympy/issues/detail?id=2607
@Vinzent: the overhead is certainly negligible in this case. All the time is spent in the multiplications.
@Aaron: You should preprocess the list of terms to collect all those with a common denominator together. That would make computation trivial in the trivial cases.
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