My wife and I both received the ICS update about a week ago and we've had different experiences. My wife's phone has performed pretty good with only a slight performance issue. Mine on the other hand has been quite painful.
Mail Issues.
I have noticed the biggest issue with Mail. For over 2 years, I've had 2 or 3 mail accounts I've used without any issues. Since the update, anything I do in mail is met with slow response times, sometimes 1 to 2 minutes or more. Shortly after the update, I cleared out all cache and temporary files, and removed all deleted mail as well. And, I never keep any mail in my inbox at all after I've read it.
The biggest issue I've found is that when I click on the accounts list at the top of the mail program, mail will completely hang and not respond. This is where you can select each account individually, or select all accounts. The list just stays there and won't go away until I hit my home button. Since I had removed all but two accounts, I decided today to go down to just one account. Even after only having one mail account, and restarting the phone, it does the same thing. It just hangs when I click the accounts drop down. Eventually, I will get a message that the mail program has stopped responding, and I'm asked if I want to kill it, which I gladly do.
The other issue is overall performance. Since the update, anywhere on the phone, I have very slow response times. Before the update, my phone was lightning fast in all programs. I've used the new Task Manager feature to see what other jobs are running. When I've had these problems, I always shut down all tasks, but I still have the same issue, no improvement. I've read where the only solution is to do a factory reset, but I've also seen where that hasn't solved issues. Since I'm at the end of my contract, I may just switch to an I-phone since I have one for work and don't have these issues.
Has anyone else experienced what I have, and does anyone have any solutions besides a factory reset?
Thanks.
John.