Deleting number of apps , free up space and hard restart is not going to solve this issue. Unless you have complete backup of iOS 7 data on Mac be ready to re-installing iOS 7.1.2. It is the only way to stop this issue.
Solution 1:- Reset All Settings
Reset you iPad device settings using Setting->General->Reset->Reset All Settings. Its increase your iPad performance little better.
Solution 2:- Perform hard reboot three times
Some people said, this method solved their slow running iPad issue.
Hold the sleep/wake button and home button upto 8 seconds. This will turn off your iPad.
Then turn on iPad. Wait few moments. Do the same thing twice to solve this issue.
Solution 3:-
Go to Setting->General->Accessibility->Reduce Motion. Turn on.
Solution 4:-
One Apple community user said, this solution solved his slow iPad 3 problem.
Open some webpages in Safari.
Go to the last tab on the right side and pinch the page with two fingers (the screen will reduce mini tabs).
Select any one of the min tab.
After safari resumed normal size, check its speed.
Solution 5:- Go to Settings and turn off the following features to speed up iOS 8
After changing this setting do hart rest two or three times. This settings make iPad 2 with iOS 8.0.2 more responsive.
Solution 6:- Reinstall iOS 7.1.2
iOS Device | Download Link |
iPad 2 Wi-Fi (Rev A) | Download |
iPad 2 Wi-Fi | Download |
iPad 2 Wi-Fi + 3G (GSM) | Download |
iPad 2 Wi-Fi + 3G (CDMA) | Download |
iPad mini 2 (WiFi + Cellular) | Download |
iPad mini 2 (WiFi) | Download |