Q: iPad screen is delayed in responding to typing and scrolling gestures.

What iPad model?

Try this  - Reset the iPad by holding down on the Sleep and Home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons. (This is equivalent to rebooting your computer.) No data/files will be erased. http://support.apple.com/kb/ht1430

iPad running slow? How to speed up a slow iPad

http://appletoolbox.com/2012/07/ipad-running-slow-how-to-speed-up-a-slow-ipad/

If You Think iOS 7 Feels Slow Here’s How to Speed It Up

http://osxdaily.com/2013/09/23/ios-7-slow-speed-it-up/

You may have many apps open which can possibly cause the slowdown and possibly the loss of wifi. In iOS 4-6 double tap your Home button & at the bottom of the screen you will see the icons of all open apps. Close those you are not using by pressing on an icon until all icons wiggle - then tap the minus sign. For iOS 7-8 users, there’s an easy way to see which apps are open in order to close them. By double-tapping the home button on your iPhone or iPad, the new multitasking feature in iOS 7-8 shows full page previews of all your open apps. Simply scroll horizontally to see all your apps, and close the apps with a simple flick towards the top of the screen.

 Cheers, Tom