2013/6/13 Bakul Shah <bakul@bitblocks.com>
.. 

chud2 / gmp-chudnovsky ratio of about of 8 (@ 10^6 digits) and
16 (@ 10^9 digits) is most due to the fact that for big nums
gmp has processor specific optimized assmebly code. And
 
gambit
uses double the space due to portable C code.  Right there you
lose a factor of two!

Wait, double space for what, and by what reason?

Mikael