Comment #34 on issue 2607 by candleb...@gmail.com: as_numer_denom() is too slow
http://code.google.com/p/sympy/issues/detail?id=2607
Last thought...what about building up the multiplications from a binary lookup of precomputed muls? e.g. if you had 8 terms x1-x8 then computed x12=x1*x2, x34, x56, x78, x14=x12*x34, x58 and then the product of all bu x1 could be computed as x2*x34*x58.
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