Hi All, I'm new here......have also experienced terrible performance after upgrading to iOS5, in fact the upgrade process was slow, painful, and also said it aborted and did I want to restore, to which I replied Yes, and it then went through the restore process, which it claimed also failed, but when I finally rebooted, it came up as iOS5, with all the new 'features', but I had to resync to get all my apps back. Sorry for the boring story, but after startup it was terribly slow. Took ages to get anything done.
So, getting on the web (from my laptop ) I found this forum, and some other articles that refer to the new iCloud - a recommendation was to disable it. I did that, and I also downloaded Process Killer and let it kill everything and clean up, and my iPad now seems to be running better.
Thanks, I'll let it go for a while, but if anyone has some good suggestions, that would be great.