If you've noticed your Sony TV starting to operate more slowly, emptying the cache is a way to help speed it back up again. The cache is where information is stored for apps, websites, and other system processes, but when it starts getting too full of information it can cause the TV to slow down. Clearing the cache is a good way to help it run faster again. Be sure to have your passwords handy before you start the process as you'll need to enter them for most of your apps after running this process.