Jurjen N.E. Bos added the comment: OMG is decimal that fast? Maybe I should change the issue then to "documentation missing": it nowhere says in the documentation that decimal has optimized multiprecision computations. It only says that precision "can be as large as needed for a given problem", but I never realized that that included millions of digits. It computed to my complete surprise 2**2**29 to full precision (161 million decimal digits) in about a minute. That smells suspiciously like FFT style multiplication, which implies that it is way more sophisticated than integer multiplication! I suggest that the documentation of the decimal module recommends using decimal for multiprecision computations, as long as you use the builtin version.
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