Fix for slow responding taps in iPhone

When I got my iPhone 3GS, I played with all the new features, like everyone else. Then they wore off and I was back to normal use. While playing games, specifically Wild West Pinball, it seemed like all the taps weren’t registering properly. Also, when I pressed both flippers at the same time, there was a slight delay.

I thought this was a glitch in the game. But as I used more multi-touch games, it seemed something was wrong with my phone. Before resorting to complaining to Apple, I thought of what could be different from using my old iPhone.

Of course, I had turned on the Zoom feature (in the Accessibility section of General Preferences) for no reason other that it was cool that I could do it.

When I turned off the Zoom feature, the taps went back to normal and the multi-touch taps respond quickly again.

Source: MacOSXHints