Why is my HTC One M8 messaging app lagging after 5.0.1 update?

can anyone help ,my HTC one m8 is lagging when i type a message, i can write most of the message before its even thought about displaying it.
i have wiped the cache partition and no joy.

loads of apps now wont work with the new system update

please help! - i am a complete techno-phobe so nice easy words please

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