Serious performance issues

[Nname]

I am facing serious issues after updating my Xperia Z1 to Android 5.1.1

- Messaging app doesn't respond most of the time

- Contacts are taking longer than ususal to show list

- Camera app is getting hang

- Other Apps are also showing low performance

- Battery is draining very fast

Please could someone help by providing  any tactical/strategicsolution.

Many thanks 

[MarlonUk1]

performing another software repair using Xperia Companion, might do the trick,

also there will be a slowdown on the device, increase battery usage in the first moments after the update, since there will be alot of background task and indexing done after the update