Performance review between linux 32 bit and 64 bit

(This can apply to all programs, not just Inkscape)
When programs are compiled into amd64 code, they get to take advantage of the new 64-bit registers such as %rip, %rax, etc.
The program can still use the lower half of this register with its corresponding 'e' variant (for example %eax).

Programs compiled into amd64 code do require some extra space for alignment considerations, but if their main purpose is to move around large blocks of data at a time, then 64-bit will be faster.

I have seen no significant speed boost from 32 to 64 bit Inkscape apart from (export) rendering speed, which is marginally quicker.

I have seen improved performance using 64-bit version (on Windows, with core i7 and 4 gb RAM) It's not a huge improvement. But I think any improvement is good. Note that this is using the current stable version.

I understand the the next major version release (and I assume currently in the development version) there is a new render for Inkscape, which will provide some improvement in performance. That probably won't be huge either. But again, any improvement is helpful (at least it is to me).

So if you don't mind using a less stable version, you can probably have some (not huge) improvement in performance by using the dev version.