from my observations....
the lags and crashes are caused by compatibility of the old version apps with 4.3
though, play store still prompts you to update the apps. after the apps updates. it still crashes / hang. so i do agree on the factory reset suggested by other fellow pros & bros.
after the reset.do a manual download of new version of the apps that you have. rather than jus updating the app. but do take note, that some apps with temp files / saved files (like games) might be gone.
so choose the particular apps which seems to be a bit sluggish after the update, but doesnt yield important info. and do a full back up on the others.
as... i still felt that 4.3 fluidity on the GUI and other areas out performed 4.2.2
so to judge that samsung screw up 4.3 might not be the best conclusion.
android is an open source when apps and the OS itself is developed at such variety wher crashes is a norm.
so i believe if v can follow the correct steps give our phone the new updates. v would b able to minimize the problems, and maximize the potential of 4.3
This post has been edited by ahnien: Oct 31 2013, 09:36 AM