As long as we are picking on portables, my iMac is 340 times faster than my iPhone (original model).

I can say that frequently make a frowney face at my iPhone and wonder what the heck it is doing while I wait, but that I never have done that to my iPad. So while the iPad browser is not in the running for "fastest javascript platform on the planet", it is "fast" for everything I've done in real life with it.

17559/347 = 50 times faster.