After the new update of 4.2.2 on Feb 6,2014 my phone performs very very slow.. cant even run a single application.. cant even pick up the call as the screen remains blank... Smart phone has become absolute dumb and for no use...
I was facing the same issue after the 4.2.2 Feb 6, 2014 update. Did a factory reset and I'm able to run applications now. The dialing and answering the call problem is resolved, but on the whole, the mobile still lags.
I was able to fix up the issue by clearing Gallery data. Go to Settings --> More --> Application Manager --> All Applications --> Gallery --> ... Here you will see data reported in hunderds of MBs. Press Clear data button and once that is complete, you phone should be back to normal.
Just go to settings --> more --> storage --> miscellaneous --> delete all data by check all file.
Before you delete all miscellaneous data make sure you had move the important file to external memory or PC.
Hope it helped :)
Gallery data may not be the main matter. The Cache and RAM have to be cleared. Just see that RAM is at least 40% free. Uninstall / clear unwanted apps.