[jrockway]

Any change on 32-bit machines will require special CPU instructions, massive Lisp slowdowns, or massive integer math slowdowns.

Considering you can't even buy a new 32-bit machine anymore, however, I don't really see this as a major problem.

[koenigdavidmj]

>Considering you can't even buy a new 32-bit machine anymore, however

Netbooks.

[dagw]

Most netbooks that have come out in the past 6 month have a 64-bit CPU. Only the old atom N2xx series is 32bit, and they are rapidly being phased out.