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If that doesn't help, then repair your phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Its probably bc of apps running on the background using up your RAM, perhaps antivirus, ram apps, taskillers, etc
Boot on safe mode and see if that helps
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
if it does then its a third party app causing this issue.
If that doesn't help, then repair your phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Hi,
You can also take a look at the following FAQ-topic to see if you can find any tips:
/t5/FAQ/Does-your-phone-feel-slow-and-laggy/m-p/347824