"If x32 compiled distributions run significantly faster than x64" IFF, but based on the currently available micro-benchmarks this seems unlikely. I've yet to see an example of a single application which is faster in x32 than best_of(x86,x86_64), and if we're in the two libraries mode then taking the choice of x86 for those few memory bandwidth bound pointer heavy apps that don't mine the scalability constraint is no worse.
"occasional application" like... my browser? (which is currently using ~4GiB of VM, though not as much resident obviously).
Not to mention the reduced address space for ASLR.
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