WORKING SOLUTION ON iOS 7 POOR PERFORMANCE OVERALL PROBLEM
Hello.
That's my final solution witch works for all my iPads and iPhones and finally is so smooth and fast on iOS 6 before.
Hope that You will all have same results.
Follow those steps:
1. Connect Your decide to PC/Mac and open iTunes
2. Go to Your device settings
3. Change Your backup device from iCloud to iTunes backup on hard drive
4. Make a backup copy of Your device
5. Turn off FindMy app in device settings (Settings -> iCloud)
6. Click on RESTORE in iTunes and restore device to original state.
7. Now You can restore Your device from iTunes Backup.
This already should make Your iPads and IPhones working fast and smooth, but if You still see lagging then do this step:
8. Go to Settings -> Accesibility -> Reduce movement and turn it ON
The difference of doing it with iTunes is that full backup copy is created and full iOS 7 installation is downloaded.
Update version isn't full and I think that could be reason of all our problems.
Enjoy!