1) Close unused apps from the background. iPad 2 / iPod / iPhone 4 with its iOS supports multitasking (running more than 1 application at the same time) and it does it very efficiently. You can play your favourite game listening to your favourite music all on your favourite iPad / iPod / iPhone at the same time. But running very many applications at the same time overloads your iPad 2 / iPod / iPhone 4 and it becomes sluggish.
While using an application, when you press the home button (the round button on your iPad / iPod / iPhone front screen), the application disappears. There are atleast some users, mostly those new to iPad/iPhone iOS, tent to assume that when the application disappears, the application is closed or killed. But in reality, the application remains in the background and still executes and consumes memory (may be not as much as when the application was in use). When there are many applications like this, eventhough iOS manages memory well, at a point your device gets sluggish.
The simplest remedy is to close these background running or temporarily suspended apps. This can be done by bringing up the open applications on your iPad 2 / iPod / iPhone 4 but double clicking the home button. Then at the bottom of your screen, a row shows up with all the open apps. Now press any of the applications in the list for a couple of seconds, till the application icons in the row starts shaking/shimmering. Now on top left of each of these icons a new round red symbol shows up with a white line inside the symbol. press on this round red symbol and the icon disappears and you can be sure the application corresponding to the icon is closed. Continue closing each of the open applications and your iPad 2 / iPod / iPhone 4 must be faster now.
2) In some cases, step 1 mentioned above alone doesn't solve the issue because some of the applications you use might be corrupted and it wouldn't have released some portion of your device memory. To solve this issue you would have to do a reset / restart of your
iPad 2 / iPod / iPhone 4. The need for this usually comes only say once in 3 months according to the apps you use. It's a good idea to restart your iPad / iPod / iPhone once in a while as this improves the performance of your iPad by releasing any of your unusable memory. But don't restart your device often and when not necessary.
To restart your iPad / iPod / iPhone , hold on the sleep/Wake button of your
iPad / iPod / iPhone which is located on the top right of your
iPad / iPod / iPhone along with pressing the home button. Press and hold it for some seconds. After sometime you can see a slider saying "slide to power off" . Slide it to power off your
iPad / iPod / iPhone . Else keep pressing these two buttons and it will restart your device. Once the device is completely power off, press the sleep/wake button and your iPad / iPod / iPhone would switch on now. Now your iPad / iPod / iPhone is has a fresh memory with no unwanted programs using up memory.
3) In some cases, you would have many applications which run on the background, even if you close them from the task manager. These applications will not be visible in the task manager but constantly run on the background checking for specific conditions like checking for online updates or checking for locations using your GPS device. These applications would degrade the performance of your device as they use your iPad / iPod / iPhone resources including processing power, memory, gps, 3g/wifi and ultimately battery life and performance. You can disable these applications from running in the background by going to Settings -> then clicking individual application settings and then switching off the activity that make it run in the background. These settings would vary depending on the application. Typical examples would be like "Refresh Rate" or "Check for updates" etc.
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