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POHow quickly does the iPad respond to touches?
 

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    1. COAre you asking just out of general curiosity or because you are doing some calculation that could cause a delay? If you are asking out of general curiosity, then it's fast enough that it really shouldn't matter to us as developers. That particular metric is a detail Apple needs to sweat over, not us. If you are asking because of a calculation, then I would say that if you're asking what the limits are of doing something, then you need to seriously re-evaluate your approach. (Moved to comments per suggestion)
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    2. CO@Philip I think you may have misunderstood my question. I'm wondering if there's a known delay between when the user first touches the screen and the first moment my code becomes notified of this event, e.g. touchesBegan is called. I'm not asking for the upper bound of a calculation that would (somehow?) take place between when the touch occurs and when I actually hear about it. I'm wondering more how feasibly I could, say, measure a person's reaction time.
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    3. COI would think that hard data on the reaction speed of the iPad from touch to display result would be difficult to come by without heading into the lower-level APIs (if that data is even accessible at all; I can see Apple wanting to keep it a secret). I've seen this question posted in game dev forums elsewhere and all I've ever seen done is user-touch to user-touch, not user-touch to screen-display.
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