A very quick post explaining how to fix the horrible lag some people are getting with typing when they update to iOS7.I just updated to iOS7 and was getting the most horrendous lag – we’re talking 5+ seconds for a key press to register when typing, unlocking my iPhone from the home screen, etc.
A hard reset (the power+home buttons) did nothing so I went to;
Settings / General / Reset
Then I just chose “Reset all settings”.
Your iPhone will reboot itself once you confirm this is what you want (if you use a passcode you will have to painfully slowly enter that in while tolerating the lag before you can confirm) and then the lag will be gone.
Hope this helps save someone a little time, as I was fighting with it for over an hour