Eureka Solution Found!!!
I have been suffering with my Galaxy Duos GT-I9082 for 2 weeks now since upgrading to JB 4.2.2. Phone Hanging, Very Slow Operations, Fast Battery Drain. I have tired all of the suggestions on the many forums... hard reboot with cache delete, 61MB patch etc... etc... but non worked. until now. So do try this, my phone back to its normal self + I have back some of the missing functions such as call holding (which is how I came across this solution)...
1) Go to Setting
2) Choose "My Device" from the Top Bar
3) Choose "Home Screen Mode"
4) Select "Standard Mode"
5) Select "OK" Erase any home screen customisation (this is very easly reset to your standard in a few minute after you complete this step.
You will find all is back to normal!! Good Luck!!!!