Do a factory data reset:
First backup anything important to you. This procedure from T-Mobile may help:
Then do the master reset:
You could also try wiping the cache partition first. Never tried that myself. After any major update like this, I always factory reset. Avoids a lot of issues.
I am going to beg to differ. Been with Android since the very start on the G1, I have seen more updates than I can remember.
After every update there will be junk left over, a factory reset or master reset will get rid of it. Just like with computers, updates can be very hard on them (phones these days are more computer than phone). If you can look back through these forums going back and watching Android grow, you will see this is the case.
You car analogy is flawed. These aren't cars, there are almost no (if not absolutely no) mechanical parts in your phone. You can say to clear the touchwiz data all you want, but that isn't going to fix issues that are inherent anytime there is a software update. These problems are caused by bits of old data being left on your system. Sure, on a car you can change a spark plug, and it might fix the problem. Here the problem isn't that easy.
I ALWAYS do a reset after an update of my phone. It isn't that big a deal, and you will come out with a better running phone.
Settings> General> Application manager >All> Touchwiz
Doing a factory reset for this would be hugely overkill. Kinda like, "My engine isn't running well" - "Replace it"
I say change the spark plugs and put in a new airfilter and see how you are doing.
Small steps first.
My instructions will either work or not- either way the there is no loss of data. If it doesn't work then you can go and factory reset after that.
Touchwiz is the problem- touchwiz can be cleared.
I do agree after major updates a factory reset will fix most issues, that being said you can work up to it. For many users a factory reset IS a big deal.
Today, I am unable to get to the forum, so I hope this reply reaches both
of you. Thank you for the advice. Clearing Touchwiz and cache didn't
work, but I learned about the clearing Touchwiz - so good to know. Factory
reset, turned out not be as fun as promised, but did work - Touchwiz is
back to its old self. Now I can spend time appreciating the software
update, which now makes colors and text really pop. I will mark the
question as answered as soon as I can get to the forum screen.