Several iPhone users are experiencing visual feedback lags when attempting to type messages on their iPhones. Symptoms include key animations not activating when keys are touched. The issue does not appear to be for a specific letter or area of the keyboard and is generally considered intermittent, though many users report a consistent problem while typing in the SMS application.
Apple Support Discussions user Delapidator relays their experience with this issue:
"On the iPhone keyboard. You know when you touch a key on the keyboard and as you touch the letter it pops up but larger? Well, occasionally when … Read more