Comment #50 on issue 2607 by asmeurer: as_numer_denom() is too slow http://code.google.com/p/sympy/issues/detail?id=2607
Well, the nested numerator like I was doing is unacceptable, because once you nest too far, the expression is unworkable due to recursion problems. But the kind you were doing with logarithmic order nesting might be acceptable, if it provides a significant speed up. Actually, from what I saw, some of your other methods were performing better or at least as well as your nested algorithm, so I'm not yet convinced of this.
And even if it does, additionally time it against how long it takes to later expand the expression vs. a method already returns an expanded expression.
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