Since upgrade to latest ios, everything is sooooo slow. Why has this happened?

Question

In Japan, using softbank.
Since an upgrade to 7.0.4, everything, and I mena everything, I try to do on the iPad, is sooo slow. It's taken overy 20 minutes to download a 13.2mb app from the iStore.
There is at least one hour a day where the internet simply doesn't connect at all.
And before people chime in with 'this is a carrier issue', it wasn't ever a problem before the upgrade, and has been a consistent problem since the upgrade.

Answer 1

How to Fix a Slow iPad
http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-A-Slow-iPad.htm
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 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 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