Xperia Z Kitkat issue

Hello, my first post on xda

I bought xperia z c6602 a month back. I liked it alot. The speed, performance everything was great. Yesterday I updated my phone to kitkat 4.4.2 released by Sony on 21 may. Now everything is messed up.

My phone has become slow. The touch responce is too slow (like millisecond hang) while typing. Status bar animation lags. Walkman playback has glitches. Playback stops for few seconds while I scroll a webpage in chrome. Overall almist everything is too slow now. I need help on this issue. Is it a bad update or anything wrong on my end! I updated the phone directly without Pc.

Thanks in advance

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