Settings > General > Accessibility > Reduce Motion -> On
如果鍵盤輸入有停頓的問題,把iCloud裡的‘documents and data’關閉(不建議,但可暫時解決這問題)
If iOS7 lag in your iPhone 4/iPad 2, turn off the parallax animations in Settings > General > Accessibility > Reduce Motion -> On
If keyboard lag problem, do this:
Disable ‘documents and data’ in the iCloud settings.
* Not advice but at least it solve the keyboard lag