freezes after update

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I have updated from stock 1.48 ITA to stock 1.66 ITA, but since I had a lot of hacks and apps installed, I first made a backup with spb backup and after update I made a rom upgrade... All went quite well, apart from outlook push account which I had to re-establish, but recently i have noticed that at random very often the phone slows down considerably, especially when closing opera 9.7... Today I had to tap 6 times on a contact quicklink before being able to call... I have to add that I also had intalled CHT 1.8 and a few old HTC hotfixes released before rom 1.66, so I am wondering if any of this hotfixes, which I believe were imported during the restore of the backup, might be causing some problems... Although the rom upgrade mode in theory should verify system files and avoid replacing new files with older ones...

restoring a backup to a new rom is always troublesome, and rom upgrade mode is no exception. it doesn't work properly.