Earlier quoted context omitted.
This is clearly not the case: the C64 could respond to input faster than the a few-year-old iPhone.
Sadly, the C64 is also quicker than Apple's iCloud website. Frequently, when I type a new note or a reminder, the lag between my pressing a key and character appearing on the screen is in several seconds. This is on a 4-core machine with 16 GB of RAM that's not doing anything else.
I'd go as far as to say that they need a new point-person in charge of their Cloud Services because whoever is doing it now is completely out of touch. iTunes in particular is embarrassing, and I personally buy less stuff because I don't want to run it (instead use Vudu, Amazon Digital, etc).