I suspect the integer operations themselves are almost negligible compared to all the other overhead with function calls, type checks etc etc. That speed gain could very well be eaten up simply by the larger working set caused by another type. (Note that I'm comparing separate treatment of 32 and 64 bit integers now, not bignums.)
It might be some idea to have 32 and 64 bit variants of vector types like Math.Matrix.
/ Martin Stjernholm, Roxen IS
Previous text:
2003-02-26 21:00: Subject: Re: 64 bit ints
Most likely gain speed. On 32 bit computers operations on 32 bit integers is faster than of 64 bit ones, but 64 bit ones are faster than bignum.
/ David Hedbor