It seems that if Pinterest really wants to appeal to international markets in the way that Facebook and Twitter do, they should be testing on even less performant hardware than an iPhone 4 and iPad 3.
At least they're trying to do something about marginally older devices, a large proportion of sites I visit at the moment seem to expect an up-to-the-minute change in hardware of everyone viewing them which is frankly insane and that's just web pages.
I'm not sure what to think of that: Either I'm spoiling them or it is just a great time to be alive.