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Check if the same occurs in safe mode:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
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You could also take a look at the following topic:
http://talk.sonymobile.com/t5/FAQ/Does-your-phone-feel-slow-and-laggy/m-p/347824#U347824