Just wanted to let you know, that i had a similar problem after pr1.2. the top cpu consuming apps were facebook widgets and hildon. removing facebook widgets helped me on that. it's described here:

http://talk.maemo.org/showthread.php...hlight=skccs32

the other possibility is, that the ota update 1.2 went wrong. did not have the time to reflash and reinstall by now.