Unhappy Prob after kitkat update pls help

i did the update a few days back(Got OTA) and move all my games to SD
Now i am having a lot of problems
1. it lags or hangs a lot
2. swipe while locked is not working
3. games while playing just shut down or exit automatically

and Dam after this update looks like my tab has be come just a paper weight i just cant use it now . pls do help and advise what is to be done

thanks in advance

Note : did a factory data reset looks like problem solved not exacly sure

Samsung Galaxy Grand 16GB with wife
Samsung GalaxyNote 10.1" N8000 32GB SD
Lenovo P780 8GB version 32GB SD

When Rajnikanth enters a room, he doesn't turn the lights on,......... he turns the dark off.